Complete the text: Our future house will be (in/on) the ocean

Complete the text
Our future house will be (in/on) the ocean. It will be (surround/surrounding) by tall trees and (blue/green) sea.
We only have (sweet/ salt) water
We need fresh water for (drink/drinking) and for growing food (on/in) the form
Ocean water is too salty (to drink/drinking)
It's also salty for (water/watering) plants
We must have the (things/ways) to make fresh water from salty water
We should be (careful/careless) not to waste water
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