I'm just curious to see what it tastes like - I like the sound of Japan and whisky together.
Only ever put a couple of rocks in the holy water at the most - I find they bring flavour out as they melt most delightfully.
I sometimes throw a rock in my bourbon but usually I want to control exactly how much water is going to end up in there so tend to use water for dilution, instead. Not as much of a problem if you're knocking them back, though.

Oh, and I can confirm the Japanese do whisky very well. You won't be disappointed.

Currently sipping cognac.
So far none of the alcoholic drinks i have taken have matched Guinness beer for me, its the best. Though i never tried wine.
<3 Guinness