Water will do in most environs. Scouts on Gatorade are another species, we don't allow Gatorade on hikes. The one exception I make is dry and very hot hikes east of the Cascades - Scouts on Gatorade over-replenishing on their electrolytes are highly preferable to Scouts down from heat exhaustion. Water still works on those hikes for me, but Gatorade is a decent and inexpensive psychological pick me up.

Mind the little booger pickers though - they'll pour in 4 packets of Gatorade mix for every quart of water. Hold them to the proper mix amount.