Cylindrical Sample Bottles with Flip Top Caps | U.S. Plastic Corp.
These bottles can handle acetone and other solvents. The 16 oz size is probably best. You just flip the top and squeeze in the amount needed.
I use an old laundry bottle with the top cut off as a tray to sit these in while inside the car...due to the fact that if you use acetone for example...they will leak slightly if on their side.
I use a strip of light colored vinyl tape vertically on the side and mark 1 oz increments on it....1 thru 16 or so.