It make seem to be complicated but it's not - it's just one stop, but you may have much less stress...
- Take underground from Airport to Zürich HB (main station)
- At the Zürich HB you have a train every hour and 37 minutes taking you to CHUR
- Change to the train going to Davos-Dorf
- On your arrival at "Davos-Dorf" you can walk 3 minutes on the Promenade, past the Arabella Sheraton until you reach the Levin`s Derby Kosher Hotel on your right side.