Sick Already

Only the second week of school and my two full time young students are sick already. What can I do for them to at least not to get sick often? Move to a warmer state on the winter and move back here up north on summer months. I hate when they are sick. I don't mind them being home and vomiting every time they drink or eat something but when they don't listen to me to take their vitamins, medicines and to drink liquids. The constant ear infections and losing weight for being sick. Ugh.

I really wish I home school them this year.