I recently did a similar blind taste-test for mineral waters vs my tap water: https://www.gwern.net/Tea#water-experiment https://www.gwern.net/Tea#water-experim

I recently did a similar blind taste-test for mineral waters vs my tap water: https://www.gwern.net/Tea#water-experiment https://www.gwern.net/Tea#water-experiment I used a lazy susan to implement randomization/blinding, and an interesting Bayesian variant on best-arm finding to try to optimize sample selection. I found my tap water is weakly in the middle and perhaps 1 or 2 mineral waters were better, but not strongly so. The results are not quite comparable to OP because I designed it in terms of deciding which in a pair tasted better, not whether I could guess which was which correctly.