Spirit drinks, such as whiskey, cognac, etc. are often above 40% alcohol, thus often render it difficult for us to taste the concealed flavors of your fine drink (unless you're lucky enough to savour the legendary Macallan 25). "Thou shalt not squander", but savour thy booze to the fullest and appreciate the layers within!
This tool will help to dilute your spirit down to a lower percentage like red wine (14.5%). Just enter the initial alcohol percentage of the spirit you intend to dilute, the desired alcohol percentage, and the intended final volume (eg. 150ml per glass).