Hi Tora Chan - I never liked bottled water in plastic; I always had a sneaky fear that plastic 'bits' would get into my water. I bought a water purifier about two years ago and it's terrific. It's not one of the stone ones, which I believe is probably better, but I get to see the gunk that filters out from my taps and it's pretty disgusting. I also get to save a lot on buying purified water; I never really liked 'spring' water, because I basically distrust anything that comes from the coca-cola/amatil corporation. If they make coke, what would they put in water???
I know what you mean about feeling bloated from water and then feeling dry at the same time. I found I felt like that a lot when I was drinking tap water. Go with your body; I often found that I could prevent that dehydrated feeling by adding lemon juice to my water. If I felt bloated, I took it to mean that I was drinking too much water; that can happen, you CAN flood your body and deplete yourself of salts and minerals that help you. I know it's a balancing act, but it does happen.

I find that some days I need buckets of filtered water, and some days I don't. Some days I have to work hard and don't have the TIME to keep going to the loo! LOLOL!!!
But I wouldn't trust anything that comes out of a tap. I hate the thought of the 'safe' and 'approved' chemicals that is put in water.
Good luck!
cheers, Niqi