Those freshwater shrimps are hard to keep alive for an extended period. What I do is put some in a cleaned out margarine tub to about half full and put a little bit of water in with them and freeze them.
Alternatively you can try putting them in a fish tank that's aerated or try buckets with a portable aeration device. You will get some casualties because shrimps don't survive for long once they are out of the water.
Try to fed them with a small amount of grated carrot and if you notice that they are eating it fed them more as you see it disappearing.