Hi Kaylynn,
To be able to find the threads where these things were discussed previously, at the forum homepage or category header scroll to the bottom of the page and click on <More Options> then under Filters select Show All.
Regular household batteries: no problem. The contacts on the batteries should not touch anything conductive and they have to be sealed in case they leak. Leave them in original packaging. If they are in a device, remove them and wrap in plastic. We can not ship Lithium batteries. Check with your local postal supervisor clarification on Lithium and on other types.
Anything under pressure, IE all aerosols, are No-Go.
Any products containing alcohol or acetone are No-Go. That's perfumes, nail polish remover, most aftershaves, most mouthwashes, most hand sanitizers, a lot of shaving gels, Absorbine Jr (curses! foiled again).
There are a lot of products available that have no alcohol. If I've never used something before I'll buy one to try myself before buying a bunch to send on to my contacts. In some cases I've found them to be better than what I used to use (and have changed over) and in others I've been sorely disappointed and had to keep hunting. Bring your reading glasses to the grocery store and read those labels.