A warning message lit on the dash saying I have to fill the washer fluid tank.

What should I use?

The owner's manual didn't specify the specs of the fluid. I assume that plain water isn't what the car is expecting. So if I can't use plain water, why?

Thanks in advance.

 

Water freezes.
Go by AutoZone of O'Reilly's, even Wal-Mart and spent $1.29
They'll know what to recommend.

 

I prefer a fine scotch, never use any cheap gin or vodka. Remember, this is an LS!

 

Some things are better savored by the driver, than wasted on a windshield.