Did you know that you can no longer automate IC²-Watermills? And you can easyly guess that I will not add a Water consuming Generator (Water consuming in the sence of Water = Profit, not in the sence of Cooking Water to Steam to make Energy of that)
Then add "real" multiblock geothermals, pump water and lava in, output steam which can be further consumed in steam turbines (yours).
Lava is cooled down to obsidian (byproduct).
*real geothermals instead would require a bigger infrastructure, like pumping water in/out of bedrock (aka earth's inner crust).
Since RL water generators are dependant on gravitational energy stored on water molecules, from sun, aka rain, i will develop an idea for it, it may or may not be codeable although.
No need to get infinite water mod too.