Amazon has the 1L (33.8oz) LifeStraw Peak Series Collapsible Squeeze Bottle Water Filter System (Dark Mountain Gray) for $22 with free shipping on $35+ or with Prime. Dick's has it for the same price.

• Protects against 99.999999% of bacteria (including E.coli, Salmonella), 99.999% of parasites (including Giardia and Cryptosporidium), 99.999% of microplastics, silt, sand, and cloudiness