No, it isn't. For drinking and even for brushing your teeth, it's advisable to stick with bottled water as a precaution. You can easily find bottled water anywhere.
The beauty of Quito is that it has spring-like weather all year round. But for fewer rain showers and more sunny days, June through October can be ideal.
Ecuador’s capital city is generally safe but like any big city, you should always stay alert. Stick to tourist-friendly areas and avoid walking alone at night.
The main language spoken in Ecuador is Spanish, but English isn't uncommon, especially among younger locals or those working in tourism-related businesses.