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Someone I know likes to mix (commercial) grape juice or wine with water or seltzer and drink the result. Of course, the first of those two ingredients normally requires "hagafen" and "al hagefen", while the second requires "shehakol" and "bore n'fashos". What proportions (and perhaps quantities) of each ingredient would require the recitation over the mixture of each of the aforementioned benedictions?

For what it's worth, note that United States commercial grape juices often include uncut grape-juice concentrate in addition to the juice.

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It appears that you need 1/6 (17%) of wine or grape juice to still be able to say hagefen. The issue is that wine nowadays is already diluted. The proper way therefore appears to be to first say the blessing hagefen on the undiluted grape juice or wine then drink the mix (water drunk after hagefen doesn't require a separate blessing).

Sources:

Aish writes

Wine that is watered down retains the bracha

When diluted, grape juice easily loses its distinctive taste. Therefore, when diluting grape juice with any significant amount of water you can no longer say [hagefen].

In practice, since it can be difficult to determine whether or not the taste of wine or grape juice has been significantly diminished when diluted, it is recommended that you say Ha'gafen on non-diluted wine or grape juice before drinking the diluted beverage.

PracticalHalacha writes

Say borei pri ha'gafen on drinks of wine or grape juice mixed with water if at least 1/7th of the total volume is wine (or grape juice) but the mixture but also still be considered to be wine or grape juice.

Not everyone agrees with the above, see e.g., dinonline

Some authorities are stringent with regard to grape juice (unlike wine), and maintain that if grape juice is diluted with water it loses the Borei Peri HaGafen blessing. Although other authorities are lenient concerning adding a small amount, this will only be true insofar as the grape juice retains its principle taste and strength [...] See Shut Minchas Shlomo no. 4, who is particularly stringent concerning adding water to grape juice; a similar ruling has been given by Rav Elyashiv z”l.

See more sources and details from Shulchan Aruch Harav here.

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    "wine nowadays is already diluted" That's rather unexpected. All wineries dilute their wine before sale? What did it start as? I don't see that mentioned on the labels. 'Wine from concentrate'? – Double AA Jan 15 '18 at 12:28
  • All I don't know but some/many is for sure. There is a famous issue with R Ovadia Yossef not agreeing to some wines "for they are heavily diluted with water" (see here). I asked a friend of mine who has a (kosher) winery and will bring back his answer. See also the last source in my answer, from Aruch Hashulchan – mbloch Jan 15 '18 at 13:03
  • You mention 1/6 but I don't see that in any of the quotations you include. – msh210 Jan 15 '18 at 13:27
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    Friend who runs a winery came back saying they don't dilute as they do high-end wine. It does happen in other places – mbloch Jan 15 '18 at 14:35
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    For anybody else who was curious,, the dilution done by wineries is apparently before fermentation. They're not making wine-concentrate and then diluting it when they bottle; the issue is that grapes with too much sugar can impede fermentation. – Monica Cellio Jan 15 '18 at 15:49

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