I used to thaw and refreeze food but it lost texture due to cystalization fractures and just turned to mush. But I see no reason you cant refrigerate it and use it within a day or two. The growth of bacteria at 36 degrees is very slow.
I have a freezer right next to my tank. Since I have such a small amount of fish, there's always leftovers. I just put the cup in the freezer and use it the next day (or 2). No problems with fish and corals eating.
+1 - I make blender mush (shrimp, Mysis, Cyclops, Clams, etc.) and freeze it in a mold used to make little cubes of Jello. Each cube feeds the tank for 2 or 3 days. I refrigerate the left-overs for up to 2 days.