I have to make a big batch, because me and my dad drink a lot!
I use 'Liption Ice Tea' bags, and use about 6 of them, I put it in hot water, and use my coffee maker.. I usually let it sit for about half an hour or so to get a really strong taste.
After that I pour it into a jar and fill the remaining 1/2 to 3/4ths with cold water.
Since my dad doesn't sweeten his tea anymore, every cup I get I sweeten it that way!