Hello Xeejoiphie76
Welcome to the SBB Community.
YES, you can use EasyRide without a SwissPass card; you simply have to carry your physical passport whenever you are using e-tickets and check-in tickets. However, I do not recommend EasyRide for tourists. It is the most expensive way of travel on Swiss public transit services especially if you do not have the Swiss Half Fare Card in addition. EasyRide does not have limit when using it at full fare; consequently, it charges you all the tickets at full fare without taking into account any possible cheaper offers.
From my point of you, you should look at tourist offers first, such as the Swiss Travel Pass, or regional passes (Tell Pass, Berner Oberland Pass), or the Saver Day Pass. It is worth to price out all your trips to deciede on the best tickets. If you will spend more than 240 CHF on full fare tickets, definitely get the Swiss Half Fare Card.
Kindly bear in mind, it is part of the Swiss culture to greet before approaching a local for asking a question.
Kind regards,
Roland