According to wiki:
“No ebolavirus-specific treatment exists.[52] Treatment is primarily supportive in nature and includes minimizing invasive procedures, balancing fluids and electrolytes to counter dehydration, administration of anticoagulants early in infection to prevent or control disseminated intravascular coagulation, administration of procoagulants late in infection to control hemorrhaging, maintaining oxygen levels, pain management, and administration of antibiotics or antimycotics to treat secondary infections.”
Sounds like more than giving them water to me.
All of which can be done in a field hospital.
Ask any military medic how that works.