When I'm not drinking goats blood, I alternate a bottle of electrolytes (nuun tablets seem to work best with me) and a bottle of water, refilling at every stop. I get nervous if I have less than one full bottle at any time. I start sipping about 15 minutes into the ride, and start with the electrolyte bottle first.

I have found that this seems to work, and besides, most SAG stops run out of goat blood too early.