apparently coca-cola have a promotion on at the moment, if you buy two litres of their product they'll give you a free 2 litre bottle! bargain!
some people freally do swear by plastic drinks bottles, they're free(ish), really hard wearing, you can squash them when they're half full so they don't splosh around in your bag, you can roll them up to pack them, they make great pillows etc.
having said all that i tend to use a 58 pattern bottle just the same as many other folk on here, they're great bottles, but ultimately that's all they are, plastic bottles.
They split easily after a couple of outings though.
Can't be relied upon, that's why they're made for recycling after one purchase really.
Although it's a good sentiment and useful in a survival situation.
I don't "do" plastics, so I use a stainless 1300ml Klean Kanteen. I also bought one of those drinking lids for it, although the lid is hard plastic, it doesn't give a taste or trigger my hypersensitivity.
Unfortunately I dropped it on asphalt when it was almost full, so it has some dents in the bottom now.
Edit: If it were a bit bigger, I'd love to have me one of these: