If your exercise regime has you drinking a combination of liquids like Gatorade and water, Powerade and Red Bull, or the old G&T, the Swigz Dual-Chamber sports bottle can keep both liquids separate.
The two chambers are intertwined so keep the "bottleish" feel intact, and has two heads up top so you can drink without getting backwash into the other chamber. Or, if your date's feeling a bit germ-conscious, you can put the same liquid in both containers and share. Just try to remember which one you roofied. [Amazon via Uncrate]