I am big on juice popsicles whenever someone is sick- with or without yogurt, but homemade fruit juice/fruit popscicles. I push vitamin C, herbal teas, zinc...
I also do lots of applesauce- we make homemade in the early summer and freeze it. I find it easy to mix in a bit of vitamin c or honey which I try to push both when sick.
I try to push garlic when we are sick- so I add it to soup, bread etc. I also push pickles- at least they are ingesting some vinegar. This last batch of soup I made I added garlic, a bit of horseradish and some mustard powder and oregano and onions (all of which have some anti-viral or other property to help with congestion/illness etc). I also try to add spinach to the soup if I can (spinach is good for chest congestion- though raw is best for this)
This time (we currently have a cold circulating)- I am pushing some honeybee pollen as well. I have been having good luck brewing 1 tea bag of traditional medicinals cold pm tea (or something like that) OR 1 Echinacea plus tea bag (celestial seasonings) with 1 green tea mixed berry tea (lipton)- my kids have been drinking this ok. If I add my vitamin C to this it adds a slight lemon flavor. You can sweeten with honey once slightly cooled which is very good for illness (don't use honey for children under age 1 at least, maybe even age 2)
When A cold drags on- I never know what to cook- ok we are sick of broth but still stuffy-- I turn my chicken soup into the filling for chicken pot pie- still got the goods in there right- lol. I also turn to tacos- you can use chicken, add chicken stock instead of water, add your seasonings, add extra garlic... You get some raw veggies with it that are great sources of vitamin C and you can sneak garlic in it nicely. I also push raw veggies when it drags on- it has lots of vit. C- and you can have them dip it in something mixed with honey (honey mustard- very good both ingredients for a cold) or add a touch of horseradish- or garlic.... )
I read on a website once- wish i knew were it was- that when you are coming down with something you should do a juice/water fast- that the body actually needs to NOT use energy for digestion during that time and instead should divert energy to the immune system (so eating takes away vital enegry and resources the body needs to fight the infection)- so you should not eat, go to bed, rest and drink lots (think they were using lots of fresh fruit and veggie juices though and possibly broths/stocks) I can't be brave enough to not encourage my kids to eat when they are under the weather (I offer whatever might be appealing- watermelon, popsicle...) However, i don't force feed them- if htye don't want anything, they don't have to, and I certainly can't see denying them food if they are asking for it (my kids don't normally loose their appetite with a cold)- I believe the sight said if you are hungry have broth- but it was more geared towards adults.