What does you question mean exactly?
Using bucket and mug instead of shower while bathing. By harvesting the rainwater or rainwater harvesting. by uing a bucket to wash the car instead of using pipe.
Answer 4 & 5 u can also search on the web
Greeks believed in gods that they always prayed to. All Greeks worship the gods and always had a ritual. They are sacred to them. It was sometimes a law to praise the gods. They had celebrations to worship gods. They believed in monotheism and polytheism sometimes.