One tea ball loose Earl Grey (preferably with orange peel or burgamont)
6 bags green tea
4 bags generic tea
1 tea ball stevia herb (naturally sweet)
2 tbsps. sugar (rounds out sweetness)
Mix all teas & stevia in gallon jar; steep in sun
before refrigerating, add sugar (cooties you don't want in your tea feed on sugar in warmth; don't add until refrigerating)
Some additions to the tea, for variety, include: orange peel, cinnamon, allspice, cardemom, corriander, clove, lemon peel. Once can always substitute 2 bags "Constant Comment" type teas for a couple of bags of one of the others.
Good caffeine content, rich flavor, very refreshing, minimal sugar calories, anti-oxidants, etc. VERY inexpensive, even when using good grades of Earl Grey.