A 2-3 ft long section of 3/8" clear hose attached to the tip of the bottle works wonders. You can feed the tube into the fill hole, then send the other end up behind the rad. Put the tip on the hose and you can fill it while standing.

Just make sure you the hose on tight or it might pop off while your squeezing the bottle.
__________________
1996 Paseo 5E-FE 269,xxx miles - Gotta fix that sagging DS door.

New hinges on the way.
1993 Camry LE 5S-FE 264,xxx miles - New output shaft seals, Trans fluid service...
1997 Mazda B2300 213,xxx miles Underbody/frame resto in progress.
Find my DIY's or advice helpful? Don't forget to hit the "Thanks" button.