Water sucks, it still reminds me of the huge football PVC water fountain during 2-a-day practices in August (90 - 100 degree days). Not to mention everything that came after that, from manual labor to hours of gym time.
Tea is life. With herbal tea flavors you can even modify the iced tea flavor. If 2 gallons of water takes 10 small black tea bags for 10 minutes to make plain iced tea, instead use 6 black tea bags and 2 flavored tea bags for 20 - 30 minutes, take out the 6 black tea bags, then leave the 2 flavored herbal tea bags in for another 30 to 40 minutes (1 hour total).
Apple cinnamon is probably the best, but raspberry and peach also do well. HEB has a cacao flavor that makes the tea taste similar hot chocolate, which is still surprisingly good cold (with Splenda).
Also, never forget that Brawndo's got what plants crave. It's got electrolights!