I’ve had plenty of gaping wounds and have only gotten stitches in about half of them.
I wouldn’t bother with the stitches. Odds are you’d only wind up with an infection oozing puss from between the stitches and a lot of scar tissue. Hopefully you’d have some surgical soap or peroxide at least. (Boil some water to make sure it’s clean) Clean it out good, butterfly it with some XXXXX’s and wrap it with gauze. If it’s a bleeder take the gauze and pack it. Clean it out a couple of times a days…repack it and cover the open area with a more gauze. (clean cotton cloth will do if need be)
If the wound is that deep, you’d probably need some internal stitches or dissolving sutures. A deep wound needs to heal on the inside first. Without the sutures the surface may heal, yet inside you wouldn’t be. What comes next is the reopening of the wound so it can be cleaned out again and then stitched properly…gangrene, septic, etc… = not fun