Doesnt work. Search for the 'water only tek' here, it should be in the sustainable extractions subforum. Someone mentioned it was working, several people tried and it didnt.
It seems that when there is a very crude mix, the DMT does not precipitate well out of a solution. It does work with relatively pure DMT in salt form, for example if you already extracted and have some DMT fumarate, and you dissolve in water, then add sodium carb solution and let it in the fridge for a few days (it's all described in BLAB tek and in the fumaric/salting subforum).
DMT acetate (when salting a non-polar with vinegar), will NOT precipitate with sodium carbonate solution but it does with NaOH according to some people's experience (but it did not work with me the only time I tried it)