Hello! As I am a nursing graduate, and we were also taught home remedies for children who are sick.
There are various non-pharmacologic ways to alleviate signs and symptoms of viral diseases since these kinds of ailments are self-limited, meaning they eventually resolve on their own.
Here are what the things I always do whenever my baby cousins would get sick:
1. For fever, I provide them a tepid sponge bath using lukewarm water (cold water can increase temperature causing them to shiver, while hot water can cause burns). Lukewarm water provides relief since it suits mostly the body's normal temperature. You can add a few drops of alcohol to help the heat evaporate within the body surface quickly, follow this immediately with drying the body surface using a dry towel.
2. For sore throat: A squeeze of calamansi juice with a cup of cold water usually works. I think honey can cause allergic reaction and lemon juice irritates the lining of the throat more.
3. For dehydration: a home-made oral solution can be made to balance the salt and electrolytes in the body, to do this, you can mix 6 teaspoons of sugar and 1/2 teaspoon of salt into a liter of water.
4. Increase water intake also to keep the blood circulating and prevent loss of water.
I also suggest cold water for sore throat since they lessen the swelling of the tonsils; hot water can further inflame them.
I hope this helps!