I do mine with the coffee maker, like others. I put 4-5 family sized tea bags in the coffee maker (12-cup), and run the water through it. I then pour that super-strong tea over the sugar in the pitcher (I need a little more than 1 cup for a gallon for my tastes... usually use about 1 1/3 cups), and stir until the sugar is dissolved. Then, top off with either cold water, or sometimes if we want instant gratification, we'll use ice and let the hot tea melt it to cool it off faster.
The reason it's done this way in the South is because if you like your tea sweet, you have to dissolve the sugar into it, and sugar won't dissolve worth a toot in cold tea, so adding sugar by the glass doesn't really work.