I've used acidulated water -- water plus lemon juice, with a healthy slug of Tabasco sauce because I like it spicy. If you're starting with kosher chicken, no need to add salt; but I don't keep kosher, so in effect I make a brine with lemon juice.
I've also used rice milk plus lemon -- not for any reason other than the expiration date was fast approaching.

It's really the acid that makes the difference.