There's a few different strategies depending on how severe it is for you. If you're only able to eat a little bit at a time, eating multiple small snacks rather than a few big meals is a good strategy. It's also good for your metabolism. There have been times where I've been so food adverse though that even a couple bites was too much for me, so I had to get most of my calories from drinks. Probiotic yogurts are a good source of a lot of nutrients. Drink a lot of electrolyte drinks too. Honestly drink whatever tastes good too. A lot of people are adamant that only water is good for hydrating you, but sometimes you do need things like juices & sodas for their sugars. My grandma swears by milkshakes making everything better, so that's become one of the only things I can stomach when I'm at my lowest lol & all the fat and sugar is good when you're not eating. Make sure you supplement a lot with vitamins too because your balances will get thrown off, which can make you very ill