I usually carry a bottle of water with me. For that purpose I use PET bottles that I buy and refill with tap water for a few days. But yesterday my mum gave me this eco by Tupperware bottle.
It's the same size as my usual bottle (500 ml) but it has a cute coral colour! It is made to be reused and hence it is better for the environment! Also handy is the shark-fin like bit of plastic on the cap for easy opening. The bottle came in a set of two for about €14 for the set.
This bottle is made from category 5 plastic. The information I found on this type of plastic is a bit contradicatory, but I think it is safer to use than the category 1 bottles that I'd been using.
Sincerely,
R.