Might have been said already but if you press the button too often you'll get too much carbonation. And that will alter the flavor. I like to use the Kool Aid liquid or Crystal Lite liquid that you use with regular water. Makes a nice carbonated juice drink. I even use powder packets by mixing them with a little water first then pouring it in. The Crystal Light Mojito one is terrific. I even squeeze in some fresh lime. Yummy!