Follow this general guideline

https://www.unicef.org/nepal/stories/novel-coronavirus

Monitor your symptoms, be alert if your fever keeps increasing. Stay isolated -- separate room, bathroom if possible. Wear a mask around your family members if you have to be near them. Don't share utensils with your family members. Your family might have it to so tell them to stay isolated unless it's absolutely necessary. I'm currently positive and isolating too. What helped me was staying off my phone and doing other activities that kept my mind away.

As for what to eat/drink, I haven't really changed my diet. Just drinking lots of warm water, herbal tea, taking multivitamins and steam.

Also for people that have to go out, assume everyone is positive as there are too many people wandering around with mild symptoms and not realising it's probably covid.

Take care, you'll be fine!