I also use foil pans as ag80n indicated....
Pans are cheap at Costco, BJ's, Sams Club, and RD... Even most dollar stores sell them 3 for a dollar here. I buy a case of 100 on E-bay with lids that way there is no foil used.
When I slice brisket or pull pork I put into the juices left from the rest. After serving the remaining juices are frozen / incorporated into a new batch of bbq sauce or baked beans.
Humphrey's DownEast Beast W/BBQ Guru