Use a 1L Ozarka bottle to prevent contamination by soda acids. Cut the top off, reverse it, might have to cut the tip off before reversing it so the shrimp can fit - submerge, place food, wait.....
You'll probably catch fish before the shrimp... but might get the shrimp to come out. Other than mantis, you shouldn't have issues with shrimp... he'll only eat what's injured, dying, or already dead.