What are some lunch ideas for someone with a dirty job and no access to a sink?

My fiance works outside all day digging up old heating oil tanks. He doesn’t always have access to a sink, and doesn’t want to eat finger food for lunch with dirty hands. He doesn’t have access to a fridge or microwave. Also, he sometimes has to eat on the go, so food that requires silverware is not ideal. What are some lunch options for this situation?

Thanks!

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