Hi,<br/><br/>Are these sentences natural to a native ear?<br/><br/><span style="color:#0000ff;">1. Does lunch at Orion on December 20 work for you? (should I say 'lunch' or 'a lunch'?)</span><br/><br/><span style="color:#0000ff;">2. How many of those bottles do you drink in a day? ( I was talking about a huge water bottle a colleague of mine had)</span><br/><br/><span style="color:#0000ff;">3. Did you stay longer? ( I wanted to know if a friend stayed at the bar much longer after I left last night)</span><br/><br/>Thanks,<br/>MG