So many methods for a D-Rank technice, also thanks
First, Sasuke goes near the lake and he puts his hands on the water, then he thinks of waves, the sea, rivers, the lakes, the incosistent of the water, the wet feel of variety, and then he focused his chakra on the palm of his hand, touching the water, then he uses nature manipulation with a strong image of water, making it into suiton chakra, then he makes small waves on the lake.
Then he repeat the process, touching the hands on the water, Sasuke thinks of lakes, rivers, sea and ocean, waterfalls, and then he focus chakra on the palm of his hand, now he applies nature manipulation with a strong image of water, making it into suiton chakra, and then he uses the chakra with shape manipulation to make the water raise in the form of a wall.
After doing it for the second time, Sasuke felt more confident, then he again make a strong mental image of water, focus chakra on the palm of his hand, then he applies nature transformation, making it suiton chakra, then he uses this chakra with shape manipulation to make a small blast of water in the lake.
Now Sasuke take his hands out of the water, makes a even stronger mental image of water, to focus chakra in his lungs, then he uses nature transformation with a strong image of water, making suiton chakra, to then exhale it on the ground and make small waves of it.
This time, Sasuke thinks of a strong mental image of water, lakes, oceans, then he focus chakra in the palm of his hand, to right after use nature transformation with a strong image of water, transforming the chakra into water in the palm of his hand, then he uses shape manipulation to turn the water into a water wall.
Again, Sasuke focus chakra on the palm of his hand thinks of a strong mental image of water, of it's caracteristics, then he focus chakra in the palm of his hand, to right after after use nature transformation with a strong menta image of water, transforming it into water, then he uses shape manipulation to make a small blast out of it.
I hope it's enought E_E