I keef beef bone broth in the freezer and find that a good cure all.
Aprt from stomach bugs. In that case I fast with just water with a pinch of salt for a day or so. Then start with a live full fat yogurt and some beef bone broth.
For colds and sore throats I agree with Brunneria home made chicken soup, and drink lemon juice in water.
Coughs I take turmeric and ginger in hot milk.