i have never seen almdudler in munich ... edit: maybe i haven't looked properly...
Moni, think RückZuck on the Landshuter Allee near Schlörstr. sells it and may have the Kräuter-Apfel? OSA's Alpenraum, a coffee bar in an architects' office on Frundsbergstr. sells it as single bottles. That's two places near you.
GG,
Tenglemann Online will deliver Adelholzener Apfel or Rote Schorle all the way up your stairs for only 5€ extra total per order with next day delivery. No Kräuter-Apfel sadly.