Water.

[Iceglow]

I drink a lot of clear-ish drinks but it's been a while since I drank water. The tap water where I live is rather hard and doesn't go down well in my system, and for some reason bottled water gives me these really bad pains in my waist in the middle of the night.

I know it sounds silly but get a brita filtration jug. They don't actually cost much and the cartridges last a long while. Most people find bottled water makes there gut ache though because they refridgerate it and it becomes near icy cold. When you drink something too cold it can cause stomach cramps.