Final answer:
The treatment for gastroenteritis involves increasing fluid intake to replace lost fluids. Antibiotics are not effective for viral gastroenteritis.
Step-by-step explanation:
Treatment of gastroenteritis generally involves increasing fluid intake to replace fluids lost in vomitus or diarrhea. Oral rehydration solution, which is a combination of water, salts, and sugar, is often recommended. In severe cases, intravenous fluids may be needed. Antibiotics are not usually prescribed because they are ineffective against viruses that cause most cases of gastroenteritis.