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.
One way to test the formation of soap is by dissolving the solid in water and checking foam formation. It can also be confirmed by performing pH test, which involves dissolving the soap in a freshly prepared 1:3 water and isopropyl alcohol mixture. The dissolved soap solution can be tested with phenolphthalein indicator and the soap formation is indicated by the color of the solution.