I have a drink with every meal - usually water or squash. I am sometimes known to have a fizzy drink if I'm dieting as it helps to fill me up so I eat less!!!
If having a full english I have to have tea or OJ with it. If eating peanut butter sarnie or on toast I have to have milk.
It is very odd (and a bit rude) for her not to offer guests a drink. I can't eat unless I have some water at least as I get thirsty. But I would have asked for one for me as well, or got up and said "do you mind if I help myself??"
And also - with kids especially they forget to drink during the day if they are busy so making sure they get some fluids with meals is a good way of keeping an eye on their fluid intake!