I will bring
unsweetened soy milk
and the ingredients to make pico de gallo. Aside from avocado I can't put anything on my tacos (no dairy, no fermented or cultured soy, no sugars) so I use a good heaping amount of it. I make it on the spicy side too. Not too hot though.

Not sure that I will get it made before I go but I will try. If not it is simple enough to do there.
Also will bring plain corn chips and black bean chips
Soda water and limes
lemons
Maybe some berries since I am able to eat some now. They are my total decadent vice. yuuuuummmmmy!