Patients with < 10% TBSA burns can be resuscitated orally (unless the patient has an electrical injury or associated trauma). In the case of patients with burns 10-40% TBSA, secure a large-bore IV line; add a second line if transportation will take longer than 45 minutes. South African Burn Society burn stabilisation protocol
Water is an ingredient that can dissolve soap. Water is a solvent and the the soap is the solute. Solutes are things that dissolve in solvents. I'm not sure what you're asking about an ingredient, but water makes all soap dissolve.
1 Don't use food coloring to dye soap. It will stain your skin when you use the soap.  To make a two-colored soap, split the melted soap base into two equal portions. Add a few drops of dye to one portion and several drops of dye of another color to the second portion. Pour the first portion into a mold. When the second portion's temperature is 125 degrees Fahrenheit or below, add it to the mold.