35 weeks and 6 days stomach virus

Sita
So yesterday evening and all last night I had a horrible stomach virus throwing up and diarreah. I weighed myself yesterday morning and this morning and I've lost 5 lbs in a day. I don't think I'll be able to eat today. Any suggestions on what I should intake To mKe sure my body and baby are doing good.  I heard lemon water restores electrolytes so I've drank some of that. And I've been trying to drink a good amount of water. Any other suggestions?