The tap water in Antigua and Barbuda is generally considered safe to drink. However, it is often advised that tourists and visitors drink bottled or filtered water, especially if they are not accustomed to the local water. This precaution is mainly to avoid any potential stomach discomfort that can occur when traveling and drinking water from a different source than one is used to.

Regarding fuel quality in Antigua and Barbuda, the fuel available is of good quality, similar to what you would find in North America or Europe. Marinas and fueling stations in the country adhere to international standards.

As for the standard voltage and frequency in Antigua and Barbuda's marinasare 230 volts and 60 Hz. However, it is important for visitors to note that the plug type used is typically type A and B, which is the same as in the United States and Canada. Therefore, visitors from countries with different plug types and voltage standards should consider bringing appropriate adapters and converters for their electronic devices.