I can't do that here (Canada), which is why it gets to be a pain. If I buy it at a parts store or a garage, they are required to fill a battery with it before I can leave. It's a controlled substance here.
I have to by the acid at chemical supply outlets which makes it expensive and on obtainable on short notice. Sodium bisulfate I can get by the ton, no questions asked.
I gew up with a father who was a mechanic. There was always gallons of this stuff as he used to refurbish car batteries. Where is that time transporter?