Ok, I am here just to chip in for the acid blood myth,
There been long debated that was a myth since many study does cannot find a conclusion of eating alkaline food/water turn alkaline in our body, as :

1 ) your stomach is very acidic, it will produce more acid when hit with alkaline, else no stomach acids, no food breakdown, so our digestive system doesn't work as direct as expected.

2) our blood pH is balance is very delicate with our organ, so it cannot move too much else it will cause a problem to the body already.

Source: https://www.healthline.com/nutrition/the-alkaline-diet-myth
on the side note. I do agree, it is not simple to reach daily RDA for calcium, but since it will stay in your body, I guess as long as you are not suffering from calcium deficiency its not a must to supplement / follow strictly .

Ah I see , I misunderstand these. So it's about "diet-induced ‘low-grade’ metabolic acidosis". It's quite a long read on that, however the effect of acidosis is more prominent when you are woman having postmenstrual / long term meat eating diet like American. Even so the study is a bit inconclusive since it take long to happen and so many factor can affect it result. Surprisingly the way to counter this is to take sodium/potassium bicarbonate(alkaline supplement) instead of extra calcium or just include fruit and vegetable for normal diet.

While for lactic acidosis , I feel less concerned, I believe our body frequently deal with it since our muscle always produce it. So I feel dairy is not that bad. Or if its a concern, banana milk sound great !
Another matter if your body have underlying issue for any of them causing acidosis because it can't cope with it.