For medical equipment (CPAP machines, humidifiers, etc.): Distilled water may be difficult to find in some regions. Check major pharmacies and supermarkets. In emergencies, bottled water with low mineral content can be used short term, but consult equipment manufacturer guidelines. In Spain, distilled water (agua destilada) is most commonly found in pharmacies (farmacias). Ask at the counter; availability in supermarkets varies.
