Suppose you wanted to carry 500-1000 ml of a solution to neutralise acid or alkali attacks, what would the solution contain? I realise it should be a buffer and it also can't be too strong to prevent damaging body tissues with heat. I guess it would be ideal if it didn't effervesce either so it doesn't spread the acid/base around? I know you're meant to douse 30 minutes with water but I'm never going to carry 100 gallons of water so that's more of a second aid than a first aid. I'm not planning on getting attacked and it may not be worth the effort of carrying around a solution for this marginal eventuality but I did wonder what the solution should contain. I figure if you're only carrying 500-1000 ml, a buffer would be more help than plain water. That said, it's more practical to carry plain water because you can also drink it. That said, I wouldn't want to drink it if I knew I needed to treat acid/base with it later.

Water.
Just diluting the corrosive material will help enormously.

The aftermath of an acid (or caustic) attack is one of the few circumstances where it is acceptable to push someone over and urinate on them.