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To make your own, you just need water, washing soda (note that you can also use baking soda) and hydrogen peroxide. Just mix equal parts of peroxide and washing soda with a double part of water. For instance, mix 1 cup of water with ½ cups each of washing soda and peroxide.
Over time, towels build up detergent and fabric softener, leaving them unable to absorb as much water and smelling funky. Recharge them by washing them once with hot water and one cup vinegar, then a second time with hot water and half cup baking soda. This strips the residue and leaves them fresh and able to absorb more water again. Works like a charm!