It is possible to repair the food processor without any parts (Repair Skill 80 needed).
If you need a second pot to help with the 2 pots bug mentioned below, there is normally a pot on the oven next to the food processor. However you will gain bad Karma as it involves stealing it. There should also be one in the kitchen of your Lucky 38 suite.
There are 2 steam gauge assemblies inside Cerulean Robotics in Freeside as well as a large amount of scrap metal, sensor modules, and pilot lights. Go through the first door in front of you, they are in the corner on the right hand side.
There is a steam gauge assembly in Camp McCarran right next to a few trucks on the top shelf and gives no Karma penalties.
There are 5 pots in the kitchen's food store in Vault 3 Recreation Area.