Purchasing drinks can become pricey if you’re buying a Coke here and a juice there, and the tap water in a lot of the places is something to fear. So I began holding out as long as I could for supermarkets and little groceries. Water at a little convenience store or a cafe in Europe can run you anywhere from 1€ to 3€, and that can really add up, but waiting for a supermarket and stocking up can really save you quite a bit – large 1.5-2 liter bottles of clean water can cost you as little as 0.17-0.40€.
I try to eat small, cheap snacks throughout the day, and then cook one nice meal in my hostel. Picking up a cheap bag of peanuts has saved my life more times than I can count while backpacking. I typically grab an apple, a banana or an orange (depending what’s cheap and in season) to tide me over until I have my snack for a late lunch. By doing this, I cut down on costs of eating out and having full meals multiple times a day. While this may not be the healthiest option, it will help you lose more body weight than wallet weight.