I think it is unfeasible, because streams of water are always changing and never consistent. It's already hard enough to figure out how you need to distort the water to get what you want, let alone how to compensate for the changes in the stream, let alone how to measure the changes in the first place. Don't forget about the inertia of the water too. That aside, I'm pretty streams of water do not pass light nearly as well as still water.
If it was a drop of water, you would still need to suspend it somehow and figure out it's shape and everything above would still hold. Also, the drop of water is probably of comparable width to the laser beam so you would get distortion anyways- it would not be like a flat lense.
if it was anything bigger than a drop it would not be able to react in time, be harder to suspend, and be even harder to control with electrostatic fields.