Please do not use water blades on cars, they can pick up a bit of grit and drag it across the paintwork leaving deep scratches. It is a big bug bear with me as when I am polishing cars you get rid of the swirls only to find a long deep scratch right along the bonnet caused by a drying blade. Keep if for wiping down the walls in your shower room.
For a dark coloured car it is best to dry it in the shade using a quality deep pile microfiber drying towel. Make sure it is slightly damp first by wiping both sides across the windscreen, then gently wipe it across the paintwork in the direction of airflow, working from the top finishing off at the bottom of the car. Giving the car a good squirt before this with quick detailer can help the water to run off as they have water softeners in them. Always use a fresh clean towel, do not be tempted to leave it to dry and use it again as there is too much risk in some grit lurking in the fibers from your last dry. If you have access to a leaf blower (that is clean) then blow in all the nooks and crannies first to get out any trapped water, it will keep drizzling out later if you do not.
Another alternative is to rinse the car off with soft water such as bottled or filtered. I use on occasion when it is really hot water from my Reverse Osmosis system which is pure and will leave no water marks, I can literally leave the car to drip dry.