My bourbon drinking friends think it is unethical to add water or ice. The local bourbon groups on Facebook will roast someone with ice or water in their glass.
To me they open up in amazing ways with a splash of cold water or ice. Sometimes the oils in the bourbon will become very noticeable and change color if it’s very cold and it will change the test, for better or worse.
I love to squeeze orange rind (skin with no white part) and get the essential oils onto my whiskey and rub the peel on the rim. Opening a single barrel tonight now that you have me thinking about it.
Here’s an interesting video I found long ago about drinking scotch.[1]