SOBER TRUTHS AND SLIPPERY MEMORIES IN A COMIC, CHAOTIC QUEST FOR CLARITY Alcoholism and Alzheimer’s. What a combo. Sounds serious, right? They both are, of course. But in the hands of playwright Jake Brasch, The Reservoir at Geffen Playhouse pulls off a theatrical magic trick: a powerfully moving and poignantly funny play, melding millennial angst with elder wisdom and folly in a heart-warming and heartbreaking semi-autobiographical tale of recovery and tough love.