Maybe two cups. But a lot of water.
At home we've long since switched to decaf. But .. no problem! I've got a tin of instant. It ran out. I didn't get any at the store today because .. well .. I am trying to cut down.
This evening a massive withdrawal headache ambushed  me and wrapped my head in a dull cloud of pain.
Me: I'm .. uh .. going down to the gas station to get some coffee.
Me: Well, we're out of the leaded instant stuff and I've got a headache.
Her: What you need is some Tylenol ...
Me: (snarling) What I need is some coffee.
The first step is admitting you have a problem. Granted this isn't heroin or booze or snorting dandelions but .. still. I'd be happier not having a headache when I go without.
So .. decaf for me. If you see me with a cup of leaded from here on in, hit me on the head.
 In 'A Rumor of War', Philip Caputo related that at OCS one of their tactical instructors yelled at them 'Ambush is murder and murder is fun'.
I don't know about the murder part but I did participate in a training exercise where we executed a hasty near ambush on the Blue team. The look of surprise on their faces was very satisfying. I hasten to add it's not because we were so good but more that we were motivated and they were trudging along wishing they were somewhere else.