vanilla works some but it will slime up the internals of your bottles and lead to bacterial issues unless you plan to boil your bottles periodically.

The pellets are okay, but it doesn't give them a good nest. some females won't nurse without a proper nest where they feel safe

Coffee or perfume deodorizers mask the smell but you can also just use a bar of Irish Spring soap to do the same thing.

Basking soda applied under your bedding with help with smell, deodorize, AND will reduce the bedding sticking to your tub or tank. A light dusting is all you need. Anything you can dump out once applied is too much, remove it.