Where online can I buy small enough funnels for.....?!
Answers: small bottles to pour in liquid in them?
you can find a typical funnel at most stores like target, walmart, meijer, kmart, bed bath and beyond etc. Most bottles have the same minimum opening so that a funnel will fit it. If you are unsure though, bring the bottle into the store with you to measure!
http://www.keychains4you.com/smflfu.html
smallest funnel i know of
The Container Store has them. Also, think about using an eye dropper. My friend, Kristine, runs a website called www.freegirlystuff.com, and she decants perfumes into smaller bottles all the time. You could send her an email right from her website and ask her. I can't give you my name to use, but she's really nice and actually, you'd probably love the website, too!