靠山吃山，靠水吃水
kào​shān​chī​shān​kào​shuǐ​chī​shuǐ

to live off the land

靠山吃山，靠水吃水 kào​shān​chī​shān​kào​shuǐ​chī​shuǐ
to live off the land
to make the best use of local resources or objective conditions to earn a living
to exploit one's position
to take advantage of one's specific circumstances or professional position for personal gain