You can buy frozen spring or egg roll wrappers or shells, bean sprouts, and tofu at Asian markets. Tofu can also be found in most grocery stores. Be sure you are using Bean Sprouts and not Alfalfa Sprouts which are thinner and have a different flavor.
Fried lumpia will turn soft and soggy if kept in the fridge. You can warm it up by heating in an oven or toaster oven on high heat for a few minutes. Re-heating in the microwave is not recommended, the lumpia will be soft.
You can make the dipping sauce just before serving. I usually make the sauce as needed, it’s simple enough to throw together.