Amen to the water thing.
I worked there for two years, only had two days when I was unwell. Be careful of salads which are sometimes only washed in tap water unless you're in an international standard hotel.
Bottled water in SEALED bottles - INSPECT - and never accept anyone's blandishments that it's only just been opened. It probably was - to fill it from the tap out the back.
A good alternative for some is Kingfisher beer. Nice drop and you can open it yourself or see the barman do it. But also be aware of sensitivities amongst the large Muslim population about alcohol and choose where you consume it. Mixed drinks - avoid ice. Often made from tap water, especially in small bars or clubs.