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: 
It becomes very simple if we are right in our understanding that our universe could be a simulated universe rather than a real one.

Because all manner of simulations are possible it is even possible to have simulations of universes being emulated inside currently running simulations.

(such as when we run gravity simulations etc).

So the chances of being a simulation are much higher than the chances of being in the real thing.

So in this case travel to the multiverse might only involve transfer of data.

Any violations of the laws of physics could also be conveniently explained by the changes data values while the simulation is running.

For instance walking on water could be fixed by running the code 

If height < 0 then set height = 0 and the object would appear to be floating or levitating.
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.