Fluids - Pure water, broth, liquids with electrolytes (coconut water). If you have a juicer, make fresh juices. Smoothies with supplements.
Salt for gargling.
Supplements - charcoal, vitamins (D3, Bs, C, etc.), minerals, chlorella
OTC for comfort - cough drops, cough syrup, aspirin, ibuprofin, etc.
Tissues
Anti-bacterial soap and wipes
Fresh toothbrushes