I grabbed this from “The Universe of Yaniv - Yaniverse“, I haven’t tried it yet but I’ll be sure to talk about it on Episode 18.

Below is their text:

We all work out, we all need re-hydration, we all buy Gatorade… wait, stop. EnerT, this simple do it yourself tea-based energy drink, may be a better (and cheaper) option.

An energy drink needs sugar (of some form), electrolytes (mostly sodium and potassium) to accelerate absorption, and may contain other ingredients. I opted for tea as caffeine has a beneficial workout benefit, and tea provides a low-level caffeine, striking my personally preferred balanced between ‘waking’ and ‘wired’. Any level of sugars under 8% is acceptable, but I find Gatorade to be overly caloric for those of us trying to balance increased workout performance with weight loss/maintenance.

EnerT Ingredients (32 oz or about 1 liter):
2 Tea Bags
6 level teaspoon sugar (24 grams)
A pinch of salt (0.5 grams)
2 oz lemon juice (about 55 grams)
30 oz boiling water

Contains:
100 calories
500 mg Sodium
60mg of Potassium (from the lemon juice)
Caffeine varies, est 100mg-200mg caffeine (depending on the tea used and infusion duration)

Estimated Cost:
Lemon juice: $0.10
2 Tea Bags: $0.06
Sugar, Salt, water, etc: negligible

Compare to 32 oz Gatorade:
200 calories
440mg Sodium
120mg Potassium
No caffeine
Cost: $1.29

Source:
http://yaniverse.blogspot.com