Davey's not the first great performer in the folk world who's been cursed with drinking problems, and he won't be the last. Matt McGinn wrote a great song about it :

I've been sailing through troubled waters
That knew no calm.
The wind was wailing o'er those waters
And my sorrow knew no balm.
Troubled waters, troubled waters, troubled waters in my soul.

I've been drinking troubled waters
To ease my mind
But in those waters, troubled waters
No solace could I find
Troubled waters, troubled waters, troubled waters in my soul.

Srorm clouds gather o'er those waters
No haven had I
I wandered o'er those waters
No love had I
Troubled waters, troubled waters, troubled waters in my soul.