A nurse is providing teaching about digoxin administration to the parents of a toddler who has heart failure. Which of the following statements should the nurse include in the teaching?

A. Limiting potassium intake is incorrect because hypokalemia increases the risk of digoxin toxicity. B. If the child vomits after taking digoxin, the dose should NOT be repeated, as it may be due to toxicity. C. Digoxin should NOT be mixed with large amounts of liquid, as the child may not finish it, leading to an incomplete dose. D. Drinking water helps remove residual digoxin from the mouth, preventing irritation and ensuring the full dose is swallowed.