Can DMT freebase be converted to DMT acetate with 10% acetic acid vinegar?
or do you need acetic anhydride for acetylation?
I don`t have the budget for any lab grade reagents at the moment but I do have strong vinegar.

Any white vinegar should do the job to convert freebase DMT to DMT acetate. Just use a hot water bath for the evaporation step so you don't end up breaking down your spice due to high temperatures.

Another note if your DMT acetate solution dries up and heating is further applied the acetate part can convert back to acetic acid and evaporate off converting your DMT acetate back to freebase. So don't leave it evaping for too long. Soon as it dries up remove it from heat. Unless you want to I obtain a DMT acetate solution of course.

thanks for clearing that up

FYI, converting FB to DMT acetate is not "acetylation".

Acetylation is related to organic synthesis (attaching an acetyl functional group), and something we don't do in general here. Conversion to acetate is simply making an ionic salt from a common A/B reaction. They are two very different things. Just wanting to be clear...

Trying to buy acetic anhydride would get you put on a list. Good job you only need vinegar.