Hi, I found round worms in some chicken poo and decided to treat for roundworms now then wait until the fall molt to treat for all worms (I plan to start treating twice per year with an all-around dewormer). I used 1 oz Wazine in 1 gallon of water in their water containers for 24 hours. It rained a few times that day (I didn't know it was supposed to). The chickens free-range so they certainly found mud puddles everywhere to drink from. Can I re-dose immediately? What if some of the chickens got a full dose and some took practically none? Will it hurt the ones who received a full dose to to get another dose a few days later (on a dry day)? Thanks so much for your help and experience!