I bought a bunch from BN for $5 a pop back then, and still have some. My solution, eventually, was to cut the giant clump in half and then pre-mix it w/ the recommended amount of water in an empty gallon water jug.
I'd just shake it up and measure out the right amount of liquid whenever I wanted a dose. Woked well that way, and as far as I know, the ingredients are cool to leave in water. Try that, if you still have any.