According to the water height provided by the poster, the water height is 2 to 3 meters, the flow rate is only 7 to 8 liters, the power is too low, and there is no no finished turbines to choose from.
You can purchase a mixed flow or axial flow water pump with a flow rate and output pressure slightly lower than the data you provided to use as an impeller.
The generator only has a few dozen watts, so it is best to use a DC motor.