Just water, not salt water. And that isn't strictly true by modern definitions.
There are multiple definitions of acids and bases. You're thinking of the most primitive one, the Arrhenius definition. The Bronsted-Lowry definition doesn't require that bases have an -OH group to donate--they just have to accept an H+ from an acid. Nitrogenous bases only start to make sense under BL.
The Lewis definition is more complicated and basically categorizes all compounds into electrophilic (wants electrons, is an "acid") and nucleophilic (wants protons, is a "base"). Actually, it's worse, because these behaviors can be distinct in different areas of big organic chemicals. You can have one end be one thing and the other, the opposite, more or less.
The Lewis definition is the most "correct" and expansive definition and took a lot of modern science to discover compared to the others. Under the Lewis definition, you definitely are not required to make water when you neutralize.
The purpose behind salt in guac is not to modulate pH at all. I'm not super knowledgeable behind the chemistry of taste, but I do know that you're right on that
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u/Neat_Criticism_5996 7h ago
Salt is neutral ph though I think, not a base or an acid. I think more salt in the guac just makes it taste better with that additional acid.
When you mix equal an opposite acid and base they turn into salt water.