a lot you would prolly want to drink atleast a gallon!
what effect would adding water to a urine sample have on it for suspected drink driving
No. Not at all.
Water
by drinking plenty water
so you dont take water from the toilet and adulterate or otherwise water down the urine sample
by drinking plenty water
You can not drink enough.
yes it do i usually use soap and water to clean my crack
You may have misunderstood what they said, you can never have urine that is too clean, but you can have urine that is over-hydrated, which means there was too much water in your urine at the time of the test.
Water, salt, no food colouring and the stale smell.
It's to make sure you can't dilute the urine sample with the toilet water. If you mix it, you will have green urine.
You have a sample analysed then use the appropriate filters.