Good resource for learning vocab and phrases related to serving food?

For background, I'm working with a group of people every Sunday where we serve people in the downtown area of my city no questions asked, and usually we have a decent number of Chinese elders come to get food. It would be nice to be able to communicate better with them sometimes. Also I studied Chinese in high school for 3 years and admittedly I didn't retain very much but I do understand pinyin and tones and some basic grammar so I have a kinda solid base of Chinese knowledge, for me it's really a matter of brushing up on some relevent phrases and vocab.

So with that being said what are some good (preferably free) resources for learning these things? I feel like the biggest hurdle for this is gonna be learning the measure words for different things. Thanks in advance!