That's why hospitals have the N95 or surgical masks.
Yeah the N95 is the gold standard and what is used for all of our airborne iso rooms (this includes covid patients) that go into a negative airflow room (surgical masks are okay but I'd never want to be within six feet of someone with active covid without a N95). Still though 12 hour shifts working in close proximity with someone has led to quite a few of our staff getting covid recently which sucks. There's still very much an active covid problem that will likely lead to another surge as people conduct maskless travel again for the holidays (as well as the piss poor vaccine rates).
Dried legumes, rice. Maybe canned veggies? Honestly just boil/bake your food for now and don't eat prepacked "fresh meals".