You can just brew tea as normal with a teapot and boiling water, then stash it in the fridge until it cools. I decided to try something different. Last summer, I started cold-brewing my tea. It's incredibly easy.
I use a tea ball for both hot and cold tea. I like to fill mine as full as possible, especially for iced tea. Fill the jar with water and place in the fridge. Let it sit in there overnight or at least for a few hours. (By the way, when this jar breaks (and it will), I'm going to buy a regular glass pitcher for my tea instead of one with a spigot. Those things are just too hard to clean adequately. We have a nice glass pitcher for cold water in our fridge we found for about $10 at a superstore.)
In the morning, I pull out the tea leaves, stir the tea and enjoy. If you like your tea more potent, just leave the tea leaves in the jar until all the tea is gone.
You don't need a pitcher or fancy jar, of course. Any plastic container or Mason jar would work just fine.
You don't need fancy tea, either. I love my loose teas for hot tea in the winter, but cold-brewed Lipton is just fine with me all summer long. If you are in the market for a special iced tea, Long Island Strawberry Green Tea