Do these contain sugar?
No. The flavour comes from natural flavourings rather than sugar or syrup, which is why a cup is close to zero calories before you add milk.
Does Irish Cream flavour contain alcohol?
No. It is a flavouring only, with no alcohol in the jar.
How much should I use per cup?
A rounded teaspoon in a standard mug, adjusted to taste. They also work stirred into hot milk for something closer to a latte.
Is the coffee caffeinated?
Yes, these are ordinary instant coffee with flavour added. Decaffeinated versions appear in the range from time to time and are labelled clearly.