Just leave a shallow saucer of water there anyway, he could be drinking.
If you are sure hes not, then you can also use a paper cup with a pinhole in bottom, sit it on top of your screen lid, over a rock, it will slowly drip down onto the rock, and sometimes collareds like to lick the drips off rock.
Also you can let an ice cube melt, the same way put on screen lid and let it drip down onto a rock.
As far as the jumping at the sides of glass, we all have gone through that, or still do with some. They seem to settle down evenually and won't do it as much. But it is kind of normal.
Is you collared new? If so, give him time to adjust.
So sorry I never saw your post way down the page, If they get to far down, we miss them sometimes, just do what ya did start back up at the top.
And you can always email,
I'm always around here or there, 
Eve