This is not a health advice, for health advice consult your doctor, and follow the official governmental and health organization announcements (CDC, WHO etc.). Yet, since there is as of this writing no known treatment the following steps may help healthy people, your body, to prepare for a potential infection with the coronavirus, the COVID19 infection.
Additional it is advised to consult your doctor if you have already a compromised immune system, known allergies, or when on medication – when trying out supplements, diets, or activities. The guiding principle should always be, do not harm, and hear on your bodies responses, how you feel.
Follow best practices for a healthy diet if possible, when under quarantine people likely consume more canned food, or foods and drinks which are not entirely considered healthy. Thus, you may start to consume more salt, or sugar for instance.
Depending on your age and condition, consider physical activity to keep your spirit high, and to burn calories, to keep in shape. There are a lot of exercises one can do at home, be creative, try to use as many muscles as possible, and or move very slowly and stretch, to some relaxing music.
With the warmest winter on record for January in the northern hemisphere, temperatures in many parts of the globe are already often in the double digits, hence a walk in the forest, running, or other outdoor activities are beneficial to your overall condition.
Even when confined to your home you may have access to a balcony, or even a garden, if not open the window from time to time and let in that fresh air.
Ascorbic acid (Vitamin C), is a good way to boost the immune system.
Wikipedia: Vitamin C distributes readily in high concentrations into immune cells, has antimicrobial and natural killer cell activities, promotes lymphocyte proliferation, and is consumed quickly during infections, effects indicating a prominent role in immune system regulation. The European Food Safety Authority found a cause and effect relationship exists between the dietary intake of vitamin C and functioning of a normal immune system in adults and in children under three years of age.
Echinacea is widely used to fight infections, especially the common cold, and the flu.
For a time, echinacea enjoyed official status as a result of being listed in the US National Formulary from 1916-1950. However, use of echinacea fell out of favor in the United States with the discovery of antibiotics. But now, people are becoming interested in echinacea again because some antibiotics don’t work as well as they used to against certain bacteria.
According to a study with mice, higher ambient humidity makes viral transmission less likely, while dry cold ambient air increases the odds of acquiring the flu virus. However, experts do not think that seasonal climatic changes will make a big dent on infection rates. Yet, increasing humidity at home may help to dent family infections.