I think I'll have to try the spout, the rinsing bottle, or the glass baster-like item for the dripping issue.
Of the 3 that you just mentioned, only the Rinsing Bottle will be practical. Why don't you buy that Plastic Funnel that I had previously described as you will still need to transfer from that Gallon Can into the Rinsing Bottle, and you can always use the Funnel for other liquids when necessary.
I have a plastic funnel so I'm good to go with that. Do you know how long I can store acetone in a rinsing bottle?