I use a RAM mount (I have a double on my left handlebar) for my GPS. I bought a cup holder for the second mount on my bike but am underwhelmed with it, I will keep using my hydration bladder I wear on my back.
You can get those cup holders in a 4-pack for $1.99 at Advance Auto Parts and probably at other chains also. They work great simply by taking a 1.5" wood screw and setting it into the bolt-hole just above that space on the inside of the windscreen. Lost one once. After that I wrapped a long twist-tie around both sides of the bolt.
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