how many of them offer u a drink alot of mine do if there in wish they didnt as it slows me down but i just like to be polite and accept
Depends if there in. Most caring ones do, some are ignorant sods that dont even chat.
Im always offered a cuppa on a hot day for some reason.. cant they see me sweating away? :

I reply with a lovely cold glass of water would hit the spot

Some give cans of coke, beer (for later).
I like it when they do, as you get to know them more, they ask you how your doing.. theres more of a bond between you then, always helps business that way. If you never see them or chat, then your more likely to get dropped i feel.