Water-based and/or silicone-based if you're using a condom (don't use silicone lube on a silicone toy)
Oil-based if you're going bareback. (Oil can damage a condom, making it more likely to break, but also protects the bottom's bottom from potential injuries better)
Clean yourself out before putting things in your butt. A cheap, reusable, washable douche is like $7. Buy one.
Saliva is insufficient for most people, though it can do in a pinch. You will probably have to "reapply".
Anything that is meant to go on the outside of your body should not go inside it, no matter how slippery (lotion, conditioner, soap, etc.)
Any additives to a homemade lube beyond the base lubricant and a hydrating compound are just up to preference, i.e., scents, flavor, and texture.
Discussion over. Moving on.
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