Water Vs. Meth

[SIVIirnoff]

I have a quick question that I want to answer before I jump into the world of alcohol injection. I am trying to figure out the best balance between getting the benefits of alcohol injection and reducing the inconvenience of trying to find/store/handle methanol. My reason for getting this setup would be to reduce detonation to protect my engine... performance gains is just a bonus.

-What kind of detonation resistance would I see with using only water?
-Would the benefits of using only water outweigh the cost and hassle of the water injection kit?
-What, if any, performance gains could I expect with using only water?

-With regards to meth, how much of a hassle is it to find/store/handle? any suggestions in this department?

This setup will be on a 2011 Subaru STi which experience has shown us that these engines are very susceptible to detonation and when detonation is present in these engines, bad things happen.