When I used Safeguard for Goats I did put it in their water but it's been so long ago i don't remember how much I used.
And I have some wormer now that goes into their water. it's called wormer plus powder it contains OXfendazole and praziquantel it says 1 teaspoon per gallon for 3-4 days then...
If you figure it out let us know. I cut holes in the top of my water bucket lids so they can't really bathe in them they can just stick their heads in get a drink and wash off their faces.