[FaddiCat]

Abbott Nutrition has a range of nutritionally complete drinks called Ensure. If you just can't be bothered eating that's probably the best way to go.

http://www.abbottnutrition.com.au/Portals/0/img/Oral%20Nutri...

No idea how much it costs though.

[duskwuff]

Ensure is available over the counter. About 200 calories per dollar, if you want to do the math that way.

[schiffern]

At the costs given, Soylent provides over 500 Calories/dollar.