I wonder if the reason why Jones juggernauts through things is because she is very impersonal. I mean, what if magic warps itself to your preconceived notions? What if everyone in the comic was a bona fide reality warper, not just Zimmy and the boy who's name I already forgot. What if not only does magic warp to preconceived notions, it also did it on a personal level?
If so, the reason why Jones basically power on through anything is because nothing really affects her personally. She doesn't think of water as some sort of cleansing medium, or something pretty to look at, or a potential drowning danger. She just looks at it as a temporary obstacle and her reality follows suite. As such, she could probably survive in the vacuum of space.
The one reason I can think of that this conjecture could be wrong is that there are still absolutes than can run counter to an individual's personal reality. For example, that one person who died in the hospital fire. Even though that person believed herself (himself?) to be alive, she (he?) was still ultimately dead. Perhaps reality instead works by consensus? Since most everyone agrees that there is death, most everything eventually dies. The one exception I can think of is Coyote. Though perhaps he simply "overrules" the pre-existing notions of death by the simple virtue of being a physical god.
On the nature of Coyote's power, that might explain why he is regarded as a lier. He used his lies to build up a (initially false but currently validated) consensus that he was a god when, at first, he was nothing but a single solitary Coyote. With a bit of a stretch, that might also explain his appearance through spirit-vision™: The teeth band and the eye band each reflect the pinnacle of either physical (he's as strong as a god, literally) or mental (he's an eternal mystery) challenge (additionally so, because the strands appear to eternally repeat and thus are infinitely challenging), but the blackness between the bands reflects outer space because, like outer space, his strength is a great void filled with a few solitary flecks of truth. But since, according the theory already set forth earlier, he had to have built himself up from an external consensus, not entirely his own will, his external power power is based, and thus restricted, on the axis that he is a challenge or an obstacle. If he ever entirely stop being a hindrance, his power and mystery will be undone and he will be nothing more than an ordinary coyote.
All that power makes him great, but it is also a great crutch. He is not the dog that wags the tail, he is the tail. Out of every character in the comic, he's probably the most pathetic. Even Ysengrin still moves as he will, although Ysengrin is well on his way to further degeneration.
On a tangent, when Coyote asks Anthony to keep in mind the real Ysengrin, I think that he meant that each part of Ysengrin he showed her was a part of the whole, and only together could one really see the true Ysengrin. I have no proof, but it would fit in line with my own ideas on the matter of what is real.