First things first, strip down, because you don't want to get any of your clothes wet. Fill the pitcher with lukewarm water and soak the tea bags in it - the water should be just warm enough to help the tea brew. When you have the water almost black, like the picture, then move on to step 3.
DO NOT use hot water! As a sunburn is a first degree burn, adding more heat to a burn will exacerbate the effects and cause further damage to your skin. Use only lukewarm water at most.