What is 2 - 3 oz of liquid?

What is the best way to measure 2 - 3 oz of liquid? I don't have to haul a scale around with me everywhere I go. Is this a shot glass? Or is there another way to eyeball this measurement?

Thanks,

Tammy

U know those little plastic cups they bring you in the hospital with the pills in them?  Well that is about 2 ozs.  I had a friend the supplied me with a ton of those for when I was home doing liquids after my surgery.  You prob can get some from the hospital. 

Denise

Perfect! Thanks.