Newbie question about croakiness

I am having issues with my voice getting croaky after a very short amount of time practicing/singng, gets that way in about 10-20 minutes. I am making sure I have correct posture and support and trying my best to keep the throat open. My throat does not hurt at all, but will get really dried out. Any suggestions on to help this?
Thanks!
Shad
Thanks!
Shad
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