we used the heavy cream and AJ (5yr old) and i had glass baby food jars. I gave the 2 yr old a bm storage bottle, plastic, because she has a tendency to throw things!
We filled the jars 1/2 way w/ cream, put on loud music and dds jumped on the bed holding their jars LOL.
AJ put basil in hers, 2yr old made plain, and I made garlic butter.
The butter turned out well. AJ's was all butter, no liquid left, Onyx's was soft butter and mine was a little liquidy but I think I didn't dry out my jar as well as AJ's before pouring the cream in.
dh said it was really good.
What would have made it better: fresh baked bread!
We had to make do w/storebought.