What kind of meals can I prep or healthy snacks for an onsite work under the heat?

Schizoaffective
I don't want to buy food all the time while I am there.
But I want to make some wholesome snacks to eat while I am working on site before I get home and get a proper meal.
I think I can get some veggie and fruits it should last a few hours.
But I have no idea for any protein source I can take.
Other than protein bars because this shit is expensive.
Any help 😕😕😕😕
What kind of meals can I prep or healthy snacks for an onsite work under the heat?
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