4.) White Lightning aka "Gas Chamber Hoof" -- I feel like a bit of a broken record here (or a White Lightning saleswoman!), but I can not say enough good things about this product. It cleared up Salem's abscess in a single treatment and is now battling his White Line Disease. It kills everything (thrush included) except hoof material, so it now has a permanent home in my tackbox. (Plus, Jennie and I made up a really fun death metal song that you sing while doing Gas Chamber Hoof -- actually the whole GCH process, while complex, is a hoot!)
So, that's my list of must-haves (at least, what I can think of at this late hour). What are your essential items? What can you simply not bear to live without?