thanks for the reply, i will take a look at the platypus bottles, theres so many differant water carrying systems out there its hard knowing witch one to go for.I've used one litre Platypus bottles for the purpose you describe for many years. They are expensive but seem to last fairly well. They have a range of stoppers and I prefer the sports bottle type which makes it possible to drink without removing, and possibly losing the stopper. I didn't get on with the type designed for a drinking tube but this maybe because I was too mean to buy the special bite valve.
I keep one in my pack and one in the pocket of my coat or daysack. The pack one is empty until I get near where I intend to camp. I walk a lot in the Eastern Pyrenees in summer where water is often hard to find and I like to carry at least two litres. If starting from home, I put a three quarters full Platypus bottle in the freezer and even on a hot day, it is still refreshingly cool.
I would add that my wife dislikes hers as she claims it makes the water taste odd, but she says this too about the Sigg bottles which we also use. Perhaps her French upbringing has given her a more sensitive palate!
I use an ordinary Platypus bottle as a wine bottle. By squeezing out the air, oxidation of the wine is minimised, so I don't see the point of the special one. In practice, wine never stays in the bottle long enough for it to be a problem!
Yep, for some strange reason wines tend to have that perplexing property.wine never stays in the bottle long enough for it to be a problem!
Apart from using water up reasonably quickly, another thing (IME..) is to use boiled water wherever possible. Some tap water can taste different after a few days, even when other precautions have been taken.Something that made a huge difference to how fresh water stays in a bottle, is if you do not drink direct from it. Pouring into a cup, or pouring into your mouth with a gap stops backwash of bacteria from your mouth, which is unavoidable how ever much you try if you put your mouth on the bottle mouth.
I suppose you could call this collapsible rather than folding but I've had no taste issues and have had 2 of then. I discovered them in the US about 6 years ago and since then they've improved the design. I like the "standability", of that is a word, the Nalgene like cap and the protected Puck they form when folded.