Portable and reusable water filtration bottles currently on the market work by purifying water as a person drinks it through a straw. For those who like to enhance their water with additives such as powdered protein mixes and flavor drops, this straw system is ineffective, filtering out the additives and clogging the mechanism. Introducing FIT (Filter Isolation Technology) water bottles, the only option on the market that reduces chlorine, copper, mercury and other impurities commonly found in tap water before it reaches the bottle. FIT allows water drinkers to not only filter on the fly, but add their favorite mix as well. Best of all, by ditching the straws, FIT retains the ergonomics and thirst-quenching gulps previously only found in non-filtering bottles. Now you can purify water from any faucet or drinking fountain, add your favorite protein mix, electrolytes, iced tea, flavor drops, or even baby formula and enjoy your refreshing, great tasting beverage anytime, anywhere - while on the go.