waterer

What kind of waterers do you all use for your sheep and goats? I'm looking for first-hand reviews of two-ball waterers, post waterers; auto waterers that have pipe run to them. Located in VA with mild winters. I have heard concerns that sheep can't use the two-ball waterers common for cattle.

I got the basic Lixit nipple for the sheep but can't seem to train them in its use...smeared it with peanut butter and that disappeared but they still aren't drinking from that source, though they didn't have any other source. Drank like crazy after being penned in with the nipple as the only...