A bit of a long shot perhaps, but do you have one of these Brita filter water bottles - in the discontinued 1 LITRE SIZE - that you don't use any more?! Perhaps siting in the back of the cupboard?!!
My partner had one, used it every day, loved it but left it in a taxi by accident >< We brought him the 600ml one as pictured, as a replacement but it just isn't that same!! I've looked everywhere to try and find one as he's been having some health issues the bigger size bottle really helped him to stay hydrated more easily. As it's been sadly discontinued, just thought I'd ask and see if anyone has one they don't want any longer as my last ditch attempt at replacing it!!