I went to the fish store and I bought some mysis shrimp. I then had to make some unexpected stops on the way home and I guess they took a little longer than I was expecting. Well to make a long story short when I got home all of the mysis shrimps were no longer frozen but were still at a cool temperature. So i tried to add water to the shrimp packets to help freeze them again from the lost water that defrosted. Is this food still safe to feed my fish?

I dont see why not.......As long as they are kicken.......only one way to find out. Throw em in. nah just kidding, put them in a hospital tank and see if they hatch right.....if they look okay and are clinging on to algae, then your problem is solved! if not.........discard them. Plus if you run a small 5 gallon with some algae and mysis.......you could raise them to feed all the time and have fresh mysis

same thing happened to me, they are fine so long as they arent warm.