what size low country boil do I need to feed 2 people?

Depends on how much each individual eats

One tray will fill 2 ppl. They give u more than ur money worth. Me n my bf always split a tray

Probably 2 plates

Depending on yall appetite, the small white container may do it or get 2 of those. They are around $10+ each. You can always go for the small aluminum pan, but you probably will have some left over.