Diego,
But should I still cut back on the fluid intake that drastically (20 oz vs the amount in the dilution sticky)?

My biggest concern with subbing is not getting caught but screwing up the temperature. From what I read in the forums this is usually the main concern with everybody. What can you say to that to alleviate it?

Sorry for all these question that may seem redundant I just want to make sure I do this right.

Also, the test I'll be taking will be a standard pre-emp UA from either Labcorp or Quest with the 50 cutoff levels.