Also, you can mix fruit juice 50/50 with water and it'll taste great (depending on thirst, possibly even better). This works with apple juice and OJ[0], but really not with soda (I tried). Of course it helps that I live somewhere where the tap water tastes indistinguishable from bottled water.

Years ago, I was in Austria a lot, where it was a perfectly normal thing to order "Apfelsaft mit Leitungswasser" (apple juice with tap water). Which you'd get for the regular price of an apple juice, in a twice as big glass, that they'd top off with tap water.

[0] also, grapefruit.