I do enjoy a milk brew in the morning with by breakfast (typically a flat white, sometimes cappuccino), despite or maybe because of my age, I don't want to be jolted awake quite like that, in the mornings lol
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After lunch though - it's just coffee.
I sweeten most of the time. Usually with a brown sugar cube, unless I’m out, and then usually Demerara sugar. Small amount, like half a teaspoon. Sometimes I do a drizzle of maple syrup, and holy hell is that yummy.
I dilute with a bit of water. My espresso comes out delicious but concentrated so I add a splash from my glass. Opens it up and brings the temp down to where I can immediately begin drinking.
Not a direct answer, but a long black is typically less water than an Americano. It's usually a bit more than a splash of water, though. I enjoy them for all the same reasons--good temperature right from the start and more to drink for a longer coffee break.
If I have time to relax I make a milk drink. If I don't, I drink a straight espresso. If I want something to sip on while I work I make an americano or filter.
I don't add sweetener directly to my coffee, but for espresso, I will often make a small milk drink (usually with oat milk) and there is some sugar in that.
Depends on what the coffee is. My own is normally dialed in enough so I can drink it atraight. My family likes dark roast and very bitter, so I'll sweeten that to actually make it tolerable.
At home, I usually do black or straight espresso. When I go out, I generally do espresso macchiato. However, I never add sugar to my coffees, because it alters the flavor profile and I don't like that.