I'm trying to worm my chickens. I've never wormed them before and I really only want to give it to a group of 4 how would I fix up a batch for just them. It says per 100 birds to give 2fl oz in 2 gal. I've got close to 100 birds but I know I water out more than 2 gal when I water them all and their not all together. I'm probably makin this harder than it is but I'm having a major blonde moment?