Hotel rooms there cost $80 to $150 a night at the budget end, and the tap water is free. The country also sells bottled water at $0.70 from vending machines on nearly every corner, which makes the refill habit optional rather than urgent.
What the Numbers Say
Bottled water costs more per litre than milk in most of the places you will pass through, and the markup climbs the further you get from a supermarket. A 1.5-litre bottle runs $0.60 to $1.20 at a grocery store in most of Southeast Asia and Latin America. The same bottle at a convenience store near a bus station is $1.50. At a sit-down restaurant it appears on the bill at $3 to $4. That is the whole argument for carrying a refillable bottle in three lines.
The arithmetic gets sharper over a trip. Two litres a day at $1.20 works out to $8.40 a week, $36 a month, $432 over a year of travel. A $25 insulated bottle with a filter pays for itself in about three weeks. The bottle is not the expense. The water is.
Where the Tap Is Fine
Tap water is drinkable in Japan, South Korea, Singapore, most of the European Union, the UK, Australia, New Zealand, Canada and the US. If you are travelling through those countries, the refill question is mostly about convenience, not safety. Public fountains exist. Train stations have them. Airports have them past security, which is where the $4 airport bottle becomes a $0 expense.
Singapore deserves a specific mention because it is the one city in Southeast Asia where you can drink straight from the tap without thinking about it. Hotel rooms there cost $80 to $150 a night at the budget end, and the tap water is free. That combination is rarer than it sounds.
Japan has more public drinking fountains than most travellers notice, and they are marked on station maps. The country also sells bottled water at $0.70 from vending machines on nearly every corner, which makes the refill habit optional rather than urgent.
Where the Tap Is Not
In most of Southeast Asia, South Asia, sub-Saharan Africa, and much of Latin America and the Middle East, the tap water is not safe to drink without treatment. That is not a guess. It is the standard advice from every public health authority that covers those regions, and it is consistent across them.
The cost of ignoring it is real. Travellers’ diarrhoea is the single most common illness affecting visitors to those regions, and contaminated water is a leading cause. A course of treatment costs $5 to $15 at a local pharmacy. A hospital visit for severe dehydration runs $200 to $800 depending on the country. The $1.20 bottle starts to look cheap.
Boiling works but takes fuel and time. Chemical tablets cost $8 to $15 for a pack that treats 20 to 30 litres, which works out to roughly $0.30 to $0.75 per litre. That is cheaper than bottled water and lighter to carry, but the taste is unpleasant and the wait is 30 minutes.
Gravity filters and pump filters cost $60 to $120 up front and remove bacteria and protozoa but not viruses unless they are rated for it. A filter rated for viruses costs $90 to $150. Over a six-month trip, a $120 filter treating two litres a day works out to about $0.33 per litre. The break-even against bottled water is around four months.
Refilling in Practice
Hotels and guesthouses in Southeast Asia will refill your bottle for free if you ask at reception. This is not universal, but it is common enough that asking costs nothing. Some places charge $0.30 to $0.60 for a refill. That is still a third of the bottle price.
Hostels with filtered water dispensers are worth $2 to $4 more per night than hostels without them, because the dispenser saves $8 to $10 a week in bottled water. That maths does not always get applied at the booking stage, but it should.
In Latin America, the refill culture is thinner. Pharmacies and supermarkets will sometimes fill a bottle for free. Restaurants will usually not, and asking can produce a puzzled look. The practical answer is to buy a 5-litre jug at a supermarket for $1.50 to $2.50 and decant into your day bottle. That brings the per-litre cost down to $0.30 to $0.50.
In India and Nepal, the 20-litre jerrycan is standard. A refill from a water shop costs $0.25 to $0.50 for 20 litres, which is $0.01 to $0.03 per litre. That is the cheapest water in the world by a wide margin and it is why long-stay travellers in those countries stop buying bottles entirely.
The Bottle Itself
A 1-litre stainless steel bottle costs $18 to $35. A filter bottle costs $40 to $90. A collapsible silicone bottle costs $12 to $20 and weighs 80 grams empty, which matters if you are flying budget carriers with a 7kg cabin allowance.
The bottle you carry is less important than the habit of carrying it. Travellers who buy a bottle and leave it in the hostel room every morning save nothing. The savings come from the bottle being on your person at the moment you would otherwise buy water, which is usually at a station, an airport, or a corner shop at 11pm.
Airport refill stations past security exist in most large hubs. The water is free. The bottle of water sold at the gate next to the refill station costs $3 to $5. The distance between the two is about 20 metres, and the price difference is the entire point of this article.
What It Adds Up To
A traveller spending six months in countries where the tap is not safe, drinking two litres a day, will spend $216 to $432 on bottled water if they buy it at convenience-store prices. With a $90 filter bottle and free hotel refills, the same six months costs $90 plus the occasional $0.50 refill, call it $150. The saving is $66 to $282.
The saving is not the main reason to carry the bottle. The main reason is that the bottle is always there and the shop may not be. Bus stations at 5am, mountain trails, overnight trains, the last 40 kilometres before a border. The $1.20 bottle does not exist in those places. The bottle in your bag does.
One number to remember: $0.60 versus $4 for the same litre of water, depending on where you buy it. That spread is the whole game. Carry the bottle, ask for the refill, and treat the $4 litre as something that happens to other people.
Leave a Reply