I used to make mine all the time but I switched to purchasing Sta-Flo by the jug. You can buy this very cheap at WalMart or a grocery store.
I mix mine 1/2 starch and 1/2 water and put in a spray bottle.
The homemade worked fine but it would mold in the bottle if kept very long. This doesn't happen with the Sta-Flo. Also, I heard some peole say with the homemade starch it should be washed out of the quilt after completing it to prevent bugs. I never had a problem with bugs but something to think about.
Barb