Wash your hands frequently, sneeze in your armpit, use disposable tissues, don't touch your face, don't shake hands, don't go to large meetings. This is the standing advice in the Netherlands.

Those are basic precautions that depend only on the availability of soap. Face masks need to be worn properly to work, and in cultures where people don't wear them normally this is an issue. Only medical staff really has a valid use for face masks now, also because of limited availability.