**Core Concept**
The management of acute watery diarrhea in infants involves the use of oral rehydration therapy (ORT) to correct fluid and electrolyte imbalances. In children without signs of dehydration, the primary goal is to maintain hydration and prevent dehydration.

**Why the Correct Answer is Right**
In infants with acute watery diarrhea, the small intestine is unable to absorb sufficient amounts of fluids and electrolytes. Oral rehydration solutions (ORS) containing a balanced mixture of glucose, sodium, potassium, and chloride help to restore fluid and electrolyte balance. The World Health Organization (WHO) recommends the use of ORS in children with acute diarrhea without signs of dehydration. ORS works by stimulating the absorption of fluids and electrolytes in the small intestine through the sodium-glucose cotransporter 1 (SGLT1) mechanism.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is incorrect because in children without signs of dehydration, there is no need for intravenous fluids, which can be associated with complications like hypokalemia and hypernatremia.
* **Option B:** This is incorrect because antibiotics are not recommended for the treatment of acute watery diarrhea in children without evidence of bacterial or parasitic infection.
* **Option C:** This is incorrect because anti-diarrheal medications like loperamide can worsen the condition by slowing gut motility and increasing the absorption of toxins.

**Clinical Pearl / High-Yield Fact**
Always remember to use the correct ORS formulation (e.g., WHO ORS or Pedialyte) in children with acute diarrhea, and consult local guidelines or pediatric experts for specific recommendations.

**Correct Answer: C. Rest with oral rehydration therapy.**