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I always like to point out that house water commonly comes into the house through copper pipes and brass fittings, so it amuses me slightly when people panic suddenly about copper/brass as if it could be dangerous when many houses have 50+ year old plumbing using that exact same mix.
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1) Copper pipes are not pure copper as I recall. Alloys have much better corrosive resistance then pure metals.
2) Ever look at the fittings in an old house? They're typically corroded as heck.
Anyway brass is an allow of copper (with zinc added) so theres no meaningful reaction between it and copper. Furthermore Zinc will protect copper from natural oxidation due to its low redux potiential ( -.76 vs. 0 for H+/H2 and +1.x for O2/H20; copper is -.34 IIRC).