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.
Once the soap is completely cool and solid, it can be unmolded. If it was poured into one mold, this is the time to cut it into bars. The soap will be solid, but should be soft enough to cut. The final stage is curing the soap for 3 - 8 weeks to allow the excess water to evaporate out.