I keep one of these in my fridge at all times. I used to brew it in the sun but found out that it tastes just as good if you let seep in the refrigerator for a couple hours. I like it a lot better than water. You can get a box of 200 or so bags of black tea at the grocery store for dirt cheap. I use about 20 bags per jug. If you make sun tea, make sure to use a glass container and not plastic because if the plastic is not BPA free, the toxins will leak into your tea once it heats up. If you add sugar and brew in the sun you also create a perfect breeding ground for bacterias to thrive in.
Lemonade hits the spot like tea never could when you're in the mood for it though.