Water/Methanol injection is what your looking for, I run winter windshield washer fluid, something around 40/60 mix on my Turbo YJ. You can run straight methanol however computer tuning is required, good luck having that done to a Jeep ECU. Don't need to worry about timing or an intercooler, also allows you to use lower octane gas.. You can get kits for N/A, T/A or Supercharged from Snow Performance, Cooling Mist, Devils Own, Alcohol Injection Systems and others.