COSTCO ROCKS!!! It's definitely your one stop shop, I would send my ex-husband in there with a list and $300 dollars later, OMG.... Where are going to put everything and he comes home with more stuff that we don't need.
When I was pg with my twins, I craved hot dogs and costco had the best! Everything else made me sick though.
As far as my son goes, He's only lost 9 teeth, but is 4 lowers are moderately crowded and He does have a deep bite. He also has a nice space b/t his centrals like his mommy did 30 years ago and I had a major crossbite of my upper laterals and I did have phase one treatment. I will make an appointment at my adjustment and have the new patient coordinator check my ex's insurance (he claims that he gets 4K per child in ortho coverage -- I hope that's the case) My son has his regular dental appt on 2/14 and he's getting x-rays then, that will also give me a better idea of what's going on. Maybe my dentist will change his mind at that point. Alot can happen in 6 months and I don't want to miss the boat.
As far as the water goes, I do it in restaurants and I've learned to be discrete by putting a napkin in front of my face or in public like in target or in a store, I take a quick swig while no one is around and swish.
Got to run, my kids are going stir crazy!!!
Sat night some of my friends are throwing me a b-day party, my real birthday was last weekend, so they are ordering pizza, I guess I will be eating that in front of them, the down side is I dont have my DentaKit yet, so I will have to pack all my wares in my purse. But such is life now. 
Love Costco!!! I'm always checking things out after I've eating something.