Yes, drinking water will dilute the urine sample making it less concentrated. They will be testing more water then urine. Any sample can be diluted. You don't want to drink to much water since the test can come back as dilute and in many places that is considered a dirty.

Absolutely NOT. Oxycontin will show up as oxycodone and oxymorphone. No morphine will show up from just taking oxycontin.

Yes

The guest is completely wrong. On the five panel drug test opiates cover morphine, heroin, codeine, oxycodone, hydrocodone, and all the metabolites of these drugs. I have been in the drug testing business for over 20 years. The 5 panel covers these: PCP, cocaine, THC, Opiates, and amphetamines. Many drugs fall under these drug classes.

It does not. The guest that answered it could show up as a methamphetamine positive is completely wrong. This will not happen. Many years ago this was a possibility but not in today's labs.

Anything that has alcohol in it can cause you to fail an ETG. Does non-alcoholic beer have alcohol in it ? It says non-alcoholic beer. It should not cause a problem.