Oh, hmm, I'm not sure if I asked my question clearly enough... just re-edited my post to make it a little more specific.
I plan on moving towards drinking "all" urine throughout the day, except for the last pee before going to sleep (which I'll save for external use), and I understand and agree with only taking the midstream from the first urine of the day ... but when I go to take other urine throughout the day, must that also be restricted to just the midstream, or can I just take the whole thing since the passageways have already been "cleansed" for the day?