Could people conceivably keep a package of baking soda or calcium carbonate with them? would that be an effective on-the-spot antidote? Hmm or maybe get to the nearest kiosk and get some alka seltzer...
Also, as a small unrelated note, I doubt calcium carbonate would work well for neutralizing sulfuric acid-- the calcium sulfate formed is for the most part insoluble and stops the reaction.
[1]http://itonlyadds.blogspot.co.at/2012/08/on-chemical-burns-v...
[2]https://www.soapqueen.com/bath-and-body-tutorials/tips-and-t...