The name of the site is Eat this much ;)
But indeed, for the site to plan a person’s total caloric intake, it really should include popular liquids (it does plan shakes and smoothies).
Coffee and tea contain very little calories, but once you add milk and sugar (including syrups), it really adds up fast. Sodas and energy drinks are packed with calories.
If you like to drink, alcoholic beverages really should be accounted for. One gram of pure alcohol contains 7 kcalories. A 12 oz beer contains about 150 kcalories.[1]