I store it in 1 gallon bags over night in the fridge. When you re-heat, if it is a little dry you can add some apple juice for moisture. I also like to mix in a little more rub. Not enough that you can see it. Just a little for flavor.
Performer, UDS, 2011 WSM, Frank-in-Weber, 120 Gallon Offset, IQ-110, ET-732