I've used whatever... alfalfa meal, molasses, EWC, compost, rye flour, leftover organics etc... I think chicken or rabbit manure would work great. I don't think peppers need a special tea that's much different from other plants. I'll be doing much more this year and probably trying some dandelion brew. Earthworm castings or guano w/ molasses is probably a pretty good start. By me, teas are sometimes tough because the tap water is horrible and we don't get much rain. I'm dreaming up a slow filter to fix my water up and make it better for organics.