1). Water is fine in Negril, super clean and nice tasting.
2). yes Club MoBay is totally worth the money. They greet you and whisk you through customs which is great in busy season and it was great for me because I didn't raise the attention of customs with all my luggage containing christmas presents for jamaican friends! free rum punch and red stripe, cool water, snacks before your trip to negril, clean bathrooms.
on the return, lots of yummy good, wireless, our plane was delayed so we hung out there, free booze, food, tv, music, and they keep up with flights..yes a hundred times to club mobay.
3). Progressive or Hi Lo in MoBay has almost everything you need. Value Master and Hi Lo in Negril also great.
4). Bug Spray a must. We buy citronella candles at Hi Lo. We also buy Vapes.
5). music wireless waterproof speaker
6). dominos
7). baggies
8). lanyard for keys
all the other tips were great as well!