I did the end-to-end Keck Trek myself back when I was young and foolish. Started off hauling way too much stuff (took me decades to learn to lighten up). Trip was marked by (1) uncertainty as to where we were owing to many trails, and spotty markings, (2) uncertainty as to when we could water up again. Sound familiar?
But we had _canoe_ maps, with considerably less resolution than yours. Did I mention we were young and foolish?
Roughly in the middle of the trail we met up with a guy who had been very lost for 3 days, did not know where he was until we showed up, and was happy to have us share our food and the trail out.