DSSS--
1) Who knows? What happened last week has very little effect on what happens this week. Doesn't Esmeralda have an alternative water source? At Es, at least you have a pool, so you have water to flush the toilet. That's the biggest 'yuck' factor. You can also wash off in the pool, if necessary. And you can buy bottled water.
2) Craig from Packlight does chair and umbrella rentals, or he has in the past anyway.
3) No idea
4) Again, no idea. Tuesday should not be as heavy as other days though. Check out the schedule on the Tuesday(s) before your date and see how heavy the plane load is. At least, once it's over, you are in SXM!