Well since summer is almost here, you will probably want to make some sun tea. If you don't want to pay for the pricey sun tea jars in the department stores, just take a clean gallon milk jug, put your cold water and your tea bags in and set in the sun. Works as well as the pricey ones do. Make sure you put the lid on to keep out ants and bees. Just one of my frugal tips.
This page contains the following solutions.
I make a half gallon bottle of sun tea using black tea and another using green tea, 2 bags in each. I'm using solar power and the tea is never bitter. Now I always have iced tea on hand and anytime I want a cup of warm tea, I use the microwave to heat it.