Scotch with two drops of water

 An elderly lady goes to the bar on a cruise ship and
orders a Scotch with two drops of water.

She does this numerous time throughout the evening.

At the last call she asks for the same again, another Scotch with two drops of water.'

As he gives her the drink, he says, 'Ma'am,
I'm dying of curiosity.
Why the Scotch with only two drops of water?'

The old woman replies, 'Sonny, when you're
my age, you've learned how to hold your liquor.
Holding your water, however, is a whole other issue.'

Thanks Randy