You can not convert ounces to milliliters unless you know the density of the substance being measured and the term "glass" is not of fixed volume.
However a standard US legal cup is 240 milliliters.
I'm not sure of an online seller, but I've seen it sold at my local grocery store in CT (Stop&Shop in Stratford, CT).
It is a type of coffee.
Coffee
Milliliters
you could serve coffee with desert or after, depending on the preference of your guests.
Brownies
To make a delicious coffee crust for a dessert, combine crushed cookies, melted butter, sugar, and instant coffee powder. Press the mixture into a pan and bake until set.
That is 230 ml.
a dessert from Italy made from coffee, it looks like a slushie
Tiramisou
No, but you could measure in milliliters, mL.
My coffee pot holds 850 ml.