SN, I try to take plain Meiji crackers first thing after I wake up. No water except for a sip or two. Supposed to wait at least 20min before eating or drinking other stuff. Eating the plain crackers really really helps me, especially if I feel the gastric juices churning.
Stick to soupy, plain, unprocessed food like porridge, yong Tao foo, xiao wan mian, kway chap, steamed egg. Teochew porridge as per kitkat's suggestion is very good! Homecooked food, can just boil plain noodles with stuff like egg, tofu, veg. Fresh fruits too. I find buns, dairy products and too much red meat super hard to digest.
Don't drink any liquids with your meals. Leave a gap of about half to one hour between food and drinks. Even teochew porridge I just take the grains mainly, and wash the liao in the porridge to get rid of oil.
Meal portion is about 1/4 to 1/3 of what you normally have. Like last night I had half a medium papaya, one kiwi, one egg. Then stone for next few hours lol.
I also found sour plum juice very easy to drink. Maybe you can try it especially for your liquid intake during fever?
Hope you feel better soon!