if you're feeling really poorly and want to stay in ketosis, consomme should do ok, check the carbs, a can should be under 10 or so. Also chicken soup if you can find it without rice, starch as a thickening agent, pasta etc- likewise 5-7/ 100gms.... Also of course you can make your own, heat up chicken w onion celery peppercorns garlic to boiling. let cool, then heat again, turn off when it boils. Take out the chicken which should be just tender and if the stock is too watery reduce it further. This will definitely keep you in ketosis and is very plain. Thats if you feel well enough- hope you are ok? If not just eat whatever you feel like and get back to your weight issues later?
If you do want to stay in ketosos the keto strips are very helpful