Whether you go to a recommended place or not always (and I can't stress this enough) carry water of your own, or buy packed mineral water only from a reputed brand. Many establishments would serve a knockoff of reputed mineral water brands, with almost the same branding colors and packaging to trick you into buying them. If you are not careful you would end up buying them 10/10 times. Kinley becomes Kinlye or Kinlay, Bisleri become Bilseri and whatnot. You are much likely to come across these knockoffs near bus stations, railway stations, tourist spots, makeshift (poorly looking) shops, etc.

"it is terribly hard to get a computer user to actually read notes" -- pretty much sums up one of the biggest problem of Stack Exchange as well. :D