Drug info - Amphetamine drug testing

[100mg Methylphenidate]

So. Swim has a drug test in probably about a week. So he decided it was okay to take a few mixed amphetamine salt tablets...so about 80mg total over one night.

Now, since water doesn't help clense THC from the body because THC is fat soluble, and it just dilutes the urine. Would it be true that since amphetamines are water soluble, that drinking lots of water would help remove the drug quicker? Or not? Swim isn't going to keep doing them after noon tomorrow. Just to make sure he's ahead of the game. And he will be consuming water. But he can't seem to find any information to answer this question.

So does anybody know for a fact if water will just dilute the urine, or will it actually remove amphetamine significantly faster from the body? I'm assuming the latter is at least partially true in this case, unlike with marijuana.