OK I've been trying to find it forever... the parts I remember is a man with a daughter who live near a small town and he makes this tea that's suppose to be good for them. Then there was an outbreak of some kind and the people are after the little girl.

Its not the Patriot is it? (not the same Patriot as the one with Heath Ledger)

http://www.imdb.com/title/tt0120786/