Oral works fine but your gonna hate life if you get sick. Put a few rocks into a small bucket so it will sink a lil and use it. Be absolutely sure to cover any cuts in Vasoline. This is salt water and on a journey foci's of pain are greatly amplified. If you do changa realize that it wears off fairly well before the real effects of the tank kick in so there's a miss there and smoking in the tank defeats the purpose of the tank. Really what you want is for the DMT to come into the float experience or it will not work. You cant go in tripping on DMT and start floating it'll be just like sitting in a pool at night. The alteration of the mind needs to be seated before the drug takes it's effect.
Thus the reason for oral consumption. You need a good 30+ mins before it kicks in to settle into the float tank and then around 45 mins right when you are 'peaking' in the tank and you have begun to loose yourself. the spice kicks in. Also add some bi-neural beats to the equation. I even started messing with a strobe light at one point. DMT in a dark room with a strobe light will seriously mess you up. In a float tank well JUST DONT.
This is where I started messing around many moons ago bout got myself killed. It's more intense than any regular spice journey, But considering most can barely handle a regular one taking it to stage 3 can be a bit much. If you go down this path brother you better have balls of steel or be too crazy to care.
If you don't sin, Jesus died for nothing.