Substitutions: Use more lime juice if you don’t have rice wine vinegar, or use half the amount of white wine vinegar. Sambal Olek is very hot, but milder Thai Garlic Chili Paste can be used, or even Tabasco in a pinch. Fish sauce can be replaced with Soy Sauce (but it won’t be as good). Bottled lime juice is ok if you have to; lemon juice is a poor substitute, but better than nothing. Thai Bird Chilies are surprisingly available now in grocery stores, but sometimes you have to buy a package — leftovers will freeze. Thai Birds are very spicy if nice and fresh — take out the seeds for less heat.