Washing your hands often with soap and warm water-- thoroughly (between fingers, under fingernails, on the backs of hands)-- is vital to staying healthy (always). Especially when you've been out and about. Be mindful of touching public surfaces with your hands-- doors, counters, key pads, ATMs, gasoline dispensers, bathroom handles & faucets, etc-- and use a paper towel, or your foot, hip, elbow when possible-- and try to keep your hands off of your face.
Immunity-boosting and antiviral foods & supplements will be very helpful, such as: raw garlic, zinc/zinc lozenges, Nano Silver (I like Argentyn 23-- 1 tsp 2x/day), Iodine, Vit D (at least 2,000 IU's/day), Vit C complex (as much as you can take before diarrhea), Red Marine Algae (extremely anti-viral), Vit A (25,000 IU daily-- but not meant for long term use), Organic green juices,
Licorice Root is helpful for the lungs (tea or tincture). As Joy AE Dennis shared, essential oils are great, too.
Some general tips: If you can, get outdoors for 20-30 minutes/day to absorb direct and/or indirect sunlight. The best times are before 9:00 a.m. and after 3:00 p.m. in the winter, or after 6:00 p.m. in the summer. Try to practice allowing the full-spectrum sunlight to enter your eyes by not wearing sunglasses during this time (don't look into the sun, of course). The sun is the most powerful immune system builder! If you can, put yourself in or near oxygen-rich environments such as oceans, forests, running streams, or greenhouses—and breathe deeply! Drink plenty of filtered water. Eat lots of antioxidant-rich fruits and veggies. Avoid microwaved and fried foods-- they can suppress the immune system! Get moderate exercise and plenty of sleep. Rest. Meditate, pray, and reduce stress in general. If you have access to an Infrared Sauna, use it! Keep a smile on your face, practice Gratitude, surround yourself with love & positivity, spend time doing things that bring you joy, and laugh lots!!