Yes! I second bone broth -- we also do miso soup, or homemade chicken noodle for meals during sickness. Anything with loads of GARLIC! I can get DD to take a spoonful of raw honey with crushed up garlic but DS is not too keen on it (although I've tricked him before..)
I also swear by Elderberry - we normally do a homemade syrup for a few weeks leading up until the "flu season" and that helps prevent a lot of the yucky illness. If the kids do fall under the weather we repeat a few times a day with Elderberry syrup OR this other syrup I have which is raw honey, garlic, tumeric, goldenrod, elderberry, and a slew of other things. That has literally stopped colds in their tracks. We also love our essential oils and I do theives + coconut oil on the bottom of feet to boost immune systems (I do that literally all winter long..) and for when they are congested I use coconut oil + eucalyptus + theives and I use lavender + peppermint for fevers.
When either kid is sick we do loads of water or tea + soups. Baths are great and if they are super congested we do a shower and with a few drops of oil to help get those boogers running/to clear up and help breath. Birthsong Botanicals on Etsy (I believe that's the shop) makes a great bundle of kids tinctures we use, and I couldn't rave enough about them!