I drink about 6 glasses of sweet tea a day. And the rest water. I make my tea 2 cups of sugar to a gallon &1/2 caffeine & 1/2 decaf. Is this ok?

No, not good... The human body is not meant to eat sugar except in occasional small quantities. Sugar does bad things to the body. There are about 12 12-ounce servings of tea in 1 gallon. If one must use sugar, limit the amount to 1 teaspoon (measured properly, as in baking) per 12-ounce serving of tea. After getting used to that drop in sugar consumption, lower the limit to 3/4 teaspoon, and then 1/2 teaspoon...