gatorade in one and gatorade in the other. i use the powdered stuff -- not cold -- just mix and go. seems to go down easier for me. i also take a little tupperware container with enough powder to make another bottle if need be.
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"When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return." - Leonardo daVinci