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Good morning I am Dr Ruff, I am a UK GP and happy to help, thank you for contacting us today.
Brown urine can often be from Urea itself, and therefore possible he is passing more concentrated urine initially. However you are right to question if blood is present. I appreciate he may not be having the darker urine tested, but if on dip and culture there is microscopic blood, this is reassuring as this is a rather sensitive test.
Certainly drinking more water will improve this, however if the rest of his urine is clear/lighter, and he is not having any increased urinary frequency or urgency then I wouldn't be concerned.
The blood test of his kidney and liver certainly excludes other concerning features.