LOL at issuing rules when soliciting replies
Couple things,
To me, it doesn't seem as cold in Amazon/Pavilion as in years past, some years I swear it felt like water could freeze in there. A long-sleeve t-shirt should be suffice, or just bring a light jacket.
There is a Smith's supermarket a couple blocks down Flamingo from the Rio, definitely not walking distance, but easy Uber/Taxi distance. Otherwise, the sundry shop in the Rio is decently stocked depending on what you are looking for.
Food at the Rio is meh at best, especially if you are trying to eat healthy. Daves truck outside Amazon is good, but at $25 a meal (I wouldn't say generouos portions either) it's not cheap. Cheaper if you buy a prepaid meal plan but I don't think you'll be there long enough for it to make sense.