I found these recipes on a post related to Liquid I.V. and Drip Drop. I'm going to copy them here just in case.

Orange juice base

3/4 tsp salt
8 tsp sugar
1 cup unsweetened orange juice without pulp
4 1/2 cups of water

Grape juice base

1/2 cup juice
3 1/2 cups water
1/2 tsp salt

Gatorade base

Choose any flavor, except red
2 cups Gatorade
2 cups water
1/2 tsp salt

Apple juice base

1 cup of juice
3 cups of water
1/2 tsp salt