A multi-functional bottle contains two separate compartments, a first compartment for water or liquid storage, and a second compartment or holding chamber, for storage of a powdered formula. The doubled-walled holding chamber is comprised of a flexible, food-grade polymer. The holding chamber has a closed bottom-end, forming the bottle's base, and an open, sealable top-end for addition of the powdered formula, and for release of the powdered formula for mixing when so desired. Sealable top-end forms an airtight seal with an agitator cap. The agitator cap can easily be released by firmly pressing (depressing) the bottom-end of the holding chamber (and bottle), allowing the user to now mix the powdered formula with the water with a single hand.