They farmed and harvested their own food, and filtered rain water.
One resource I found said the the economy of the Aztecs was based on agriculture.
agriculture
Iowa's economy is based on Agriculture.
industrialization
An agriculture economy is based on farming.
The economy of agrarian societies was based on agriculture.
Agriculture
Kenya's developing economy is based on agriculture and tourism.
The economy of the Middle Colonies was not characterized by plantation agriculture. The Southern Colonies had an economy based on plantation agriculture.
Agriculture
The economy of early civilizations was based around agriculture.
The Roman economy was based on a combination of agriculture, trade, and taxation. Agriculture was a crucial part of the economy, with the majority of the population involved in farming. Taxation was also a key source of revenue for the Roman government, helping fund the military, infrastructure, and other public services.