I have been using a water bottle from klean kanteen for years. It isn't cheap, but it has served me extremely well. In a world full of disposable plastic bottles, having something metal just feels good. Mine has a brushed surface and feels really nice. I don't know why, but I just prefer the taste of water out of it more than a plastic bottle (trace minerals?). Water also feels like it stays colder in it even though it isn't insulated.
The mouth is wide enough to clean easily with a brush, but not wide enough that it is awkward to drink out of. Don't worry about spilling and looking like some kind of idiot.
Mine has a few dent from use, most notably a little bike crash I had, but it will never completely give out on me. Plus, it looks classy n' stuff. I think if you are in the market for a water bottle you never need to replace, this works well. Sure you can go for a milsurp canteen, but they don't fit in normal bottle holders. Just buy this one man. Make life easy.