If you rely on reagents and you don't have a 100% LRC suit, then you need a pack animal to hall in enough reagents and other resources to last as long as you plan to stay down there.
I suggest taming or buying a Blue Beetle. Wait for it to be bonded, then ride it down to DOOM. It will get tired, so don't ride it any further than you have to. Also, bring plenty of raw meat to feed it whenever you dismount from it (to avoid the possible bug where it will go wild if you leave it down there too long). Park it in the Vendor shop and ride a Ethereal Mount. When you want to log out, unmount from the Ethereal and remount your bug.