Looking for a tasteless emulsifier, or a method to mix oily substances into water
Use soy lecithin powder. Cheapest and easiest place to find it is in the drugstore where drink supplements such as Ensure nutritional drinks are kept for those unable to eat solid food. It lasts forever and has no taste whatsoever. It is the perfect emulsifier when egg yolks or mustard aren't an option. Start with about a teaspoon for your average vinegrette recipe. Can also be used to make vegan mayo in place of egg yolk. Lecithin can also be used to make foams. The proportion needs to be more precise, however. Too much can collapse foams, but when done well, it will last as a foam for hours good luck.