Brita fill and go bottle.

[River Song]

Lifestraw is fine and filters a whole lot of crap except Fluoride which shouldn't worry you unless you are a left-wing trade unionist green veggie lesbian one parent family

Trouble is it takes a l---o----n----g time to quench your thirst.

My first line of defence is a ECO stainless steel water treatment bottle which contains an inbuilt filter
I can't remember where I got it from but it was about £30-£40 - Nice Buy