Make your own electrolyte drink

4 cups water
1/2 to 3/4 tsp clean salt
Juice from 1 orange
Juice from 1 lemon
7 drops liquid stevia (also can use pure maple syrup, honey, or raw sugar for sweetener)

For post workout/recovery from intense exercise

Baking soda sipper (http://espn.go.com/espnw/training/nutrition/article/6642310/make-recovery-drinks)

That handy kitchen helper sodium bicarbonate, aka baking soda, doesn't just kill odors and put out fires. It can also counteract the buildup of lactic acid that causes the "burn" you feel when muscles are overloaded or overtaxed. Research in the International Journal of Sports Medicine suggests that adding baking soda to your water after intense cardio intervals can prevent soreness and stiffness.

4 cups water (or 1 liter) 
1/2 teaspoon baking soda
1/2 - 1 teaspoon sea salt
2 tablespoons sugar or agave nectar
1 tablespoon freshly squeezed citrus juice

Combine all ingredients in a bottle. Shake well to mix.