Hello Elephantemg83
Am I right if I have got the impression that you will be travelling on a budget? If so, I wondered why you wanted to visit Vaduz. Is it for a family visit? Otherwise, there is really no reason to go there. And you save some money.
Having chosen Zurich as a base, I must say you have chosen the most expensive city, also what concerns public transportation cost. You would have better stayed in Lucerne. Much more Swiss, less costly, more charming.
What are your plans for Triengen and Beromünster? Paragliding?
Local short distance tickets are usually valid 2 hours, a return ticket is valid the entire day and allows travel at will during its validity and the zones indicated on the ticket. I think single tickets could work for your needs. And yes, these tickets allow intermediate stops.
You might want to tell us a bit more on your travel plans.
Kind regards,
Roland