LB, people who are very careful about gebrokts do not make their korach “sandwiches” with wet lettuce. They are very careful to dry all lettuce and use a minimum of charoses, which should not contain water, only wine/fruit juice.
On the issue of the OP, I would not suggest taking anything of my own to feed animals at a farm as there are things animals should not and cannot eat. Only the farmer knows what is healthy to give them. If it is Pesach, possibly do not go visit farms (as may have been suggested in the other thread DY linked) or do not feed the animals.