Buy the best virgin olive oil you can for any dish that you will
taste the oil, for example a mozzarella & sliced tomato salad. Buy regular
olive oil for dishes that the oil is one of many ingredients and will not
be tasted. But both these oils can all stored at room temperature in a cool,
dry place. Watch the oils for clarity. If they appear cloudy, they are becoming
rancid and need to be thrown away.