Ditto that Charles (and Ron)
I use a picnic-style mustard bottle I got at our 5 & 10 (I think it is one of the last in the country!). Has the cap attached to a built-in "leash", can't misplace it. Best $1.49 I spent!
I found the condiment bottles at restaurant supply stores work great. They have the wider openings for pouring the glue into without having the glue blob out and running down the sides and all over your hands.