For what? For "ABS Juice" for print adhesion, I just got a 32 oz spray bottle from the hardware store, filled it about 24 oz full of acetone, then slipped in old brims and skirts. I didn't keep track of how much, though. It's still pretty thin, thin enough to be sprayed.

I also have another glass bottle of acetone in which I put much more ABS, to make a thicker slurry with which to repair cracks or glue parts together.