4 days without food, water, or sleep while standing in one place is how many vision quest and was how I was taught to vision quest. You don't need anything to have a waking dream if you practice this way as after about 48 hours the visions will start to come if not sooner in some cases. With that being said, taking pejuta can definitely alter the effects in what I would consider a positive and more profound way.
With that being said, why do something so difficult if one does not need to? If it is your tradition or you feel especially drawn to do something like this then by all means look into it. Explore that possibility, but don't undertake it lightly. Some even make the experience more profound by fasting in darkness. The Taoist tradition is one that comes to mind that uses the dark to accentuate that experience.
I wish you well in whatever you decide to do.
When I graft you graft we graft