I use a modded Kruzer Kaddy...
A couple of star washers in and out, and crank it tight, it doesn't rock. I can put those tall water bottles with the dish soap type tops, or the travel Gatorade bottle with the twist open top, or my stainless tall coffee cup.
I need to find a bottle with a long straw that I can use with a fullface though. The helmet makes the trip to work nice, as I have to man phones and can do so with my '14, or add another hour on to my work day.
It is only 65 miles to work, but it was 97º and full sun today, a sip of water would have been nice. I'll ride home in the dark, much nicer.