Expertly mixing drinks
I'm not the only one who does this, but I mix sophisticated cordial with water and throw in 3-5 cubes of ice in a mug (my tumbler glasses have all been smashed), I can never be too careful with a fiery housemate, damaging property, lucky for me I forced it to not happen again, but he wants it to when he's angry.
As for drinks without alcohol, which is the theme of this post, I no longer make an Arnold Palmer (made from iced tea and lemonade with ice) but I make iced tea with ice in a mug and since I'm puritanical this is the drink I should be having.
Since I have citrus fruits I wouldn't be shy to have a water with a twist of lemon and ice, maybe one day I'll garnish it with a mint leaf, or maybe just a twisted lemon slice.
I definitely mix a tropical cordial with water adding ice on a hot Spring day, not as unusual as it sounds.
Many people in my 66% population do this.