You don't need to use a starter at all, at least for most ferments. Some of the fruit ferments are different, but I've made: NT ketchup and mustard, kimchee (love it), carrots, miscellaneous veggies, and pickles without dairy or any other starter. Bacteria from the air and/or the veggie surface are sufficient. There are lactobacillus bacteria lots of places, they got the name by noticing and isolating them first in dairy products (thus the lacto- prefix) but the type of bacteria are common, and lots of traditional fermenting, think pickles or sauerkraut or kimchee, didn't use dairy.Â
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There's a long thread in this forum, Fermenting Veggies (or is it Vegetables? look for the word Fermenting and lots of replies, say > 100 replies to the thread) it discusses the whole issue a lot more thoroughly and succinctly than NT or Wild Fermentation (love WF, the thread's just quicker).Â