Question: Edit: Let me first thank all of you for being patient with me (I’m by no means a physicist) and for answering my question. This is an update to my previous question. I’ve done some research and to the best of my knowledge the idea that multiple universes could exist is a result of cosmic inflation and the principles of uncertainty in quantum mechanics. Basically (as I understand it) the idea is that during cosmic inflation after the Big Bang due to these uncertainties in quantum mechanics different regions of space time began their ‘Hot Big Bang’ period at different intervals. Thus the gap between universes is the result of the continued inflation of the universe after this happens. So my new question is: could we not just travel there via space? Grant it would be very difficult considering space is still inflating making the distance between universes farther and farther as time passes. But let’s say we use a little handwaving and make it so the teleportation of organic matter is possible or we create a wormhole that won’t collapse almost immediately upon formation and won’t kill us. I’m trying to fill the gaps with as much actual science as possible and whatever is still vastly unknown can be filled in with pseudoscience. Thanks again.

Answer: 
1. It is not proper multiverse, but multi simulated universe, with a central control mechanic. Not that it matter.
2. The central mechanic control how information pass from one universe to another. It is somewhat similar to "type cast" in programming, where there are similar type in other universe that can "simulate activity" of this information
3. The material part of human in one universe do not travel, but they get sensor (eye, touch...) information from that other universe, and their command (movement of body) pass to that other universe. Give feeling similar to how you dream.
4. The tech required: information about how to communicate with central mechanic and with other universe. No need for material movement.
Travelling the multiverse is currently magic because our physic and mathematical models are not up to the task of adequately representing fifth or higher order dimensions required to plot an exit point and return safely. So you could do a cheat and "find" an ancient artifact that acts as a portal (tv shows such as Sliders, Twilight Zone or Stargate SG1). Were humans able to build such a device that could breach the veil/barrier it would require a ridiculous amount of energy and would not be something portable in scale. The computations would require the use of a super computer or several working together.