I do compost for fertilizer. I also add the used coffee and green tea and add it to my compost. The lettuce and the tomatoes like a lot of water. You need to water them at less two times a day but if hot then three times.
I have been growing the lettuce in pots this year to try something new for the SHTF time. If I need to bring them in at night I can do that. I have a second floor were they can get sun and water that I set up.