How many grams are in one slice of bacon?
It depends on the bacon I believe. Look on the package that you purchased and it should say the amount of carbohydrates per serving.
Will uncooked bacon be good if you left it sit out all night?
Generally, yes. That is not enough time for previously properly stored and cooked bacon to "turn" and go bad. But don't get too comfortable with leaving food out for long periods. Things (bacterial or mold growth and chemical changes) begin to happen to it as soon as you have finished preparing it.
You will get the bacon after completing the fourth level in the pool (3-4). Crazy dave will give you one diamond (1,000 coins) for it and there will be new items in his shop.