The advice to stay well-hydrated or even mildly overhydrated has been a longstanding recommendation for those with mitochondrial disease battling a standard viral illness.
As with any person that has or may have COVID-19 the persistent cough or shortness of breath can be a symptom of more serious involvement and should be discussed with your medical provider.
The most serious lung condition that occurs with COVID-19 is acute respiratory distress syndrome (ARDS). ARDS and other pulmonary conditions such as pneumonia and pneumonitis are often treated with medications that result in dehydration. If your doctor is recommending ARDS-related medications or a reduction in the fluids being given, we suggest following that advice.