Someone else mentioned in another thread they used a hose from Napa, but don't recall the thread or the part number, do a search here. Just refill as you normally would, but you can add more distiller water to the intercooler vice antifreeze...option is yours. Yes, purge the HE tank and lines. I simply grap the hoses at the pump and squeeze continuously which helps remove entrapped air. If you didn't drain that far down, then it shouldn't be much of a problem. I used a small old turkey baister to remove most of the fluid from the PS tank, but some will still spill. Just drape plenty of rants under the tank.
Then just run the car and let the systems recirc and remove remaining air, caps off. Ensure to have your heater on hi...if HE flow still isn't sufficient, just reach down and squeeze the hoses some more.
The problem with the upper hose is it's preformed, which constricts it's movement, hence tank being pulled to one side. I think any straight hose would work to fix, just cut it long enough to flex while positioning the tank.