Complete your shopping within half an hour. Why: Customers spend 50 cents a minute after they have been a supermarket longer than 30 minutes. The almost empty shopping cart invites impulse buying.--What to look for---1-Generic products.Most popular; Paper good, Canned fruits and vegetable, laundry products and soap, soft drinks canned soups and canned tuna.---2-Don't be taken in by advertisements pushing premium paper towels (those that are extra-strong or  super-absorbent). For most uses( wiping up a small spills or drying your hands),the typical supermarket economy brand probably dose the job equally well.---3-Domestic seltzer. Have no add sodium, and  they are less expensive than most imported mineral water. Insight: Price seldom parallels the taste and quality of various brands of bottled  water. often the least expensive have  cleanest taste. Basic types;(1) A Sparkling mineral water is carbonated water from an underground spring. (2) Seltzer is carbonated tap water, usually withmineral salt added.(3)Buy milk in container, not translucent plastic jugs. reason: When exposed to fluorescent lighting in the supermarket, milk in the jug oxidizes.-The meaning of the word (oxidize)-1-combine or cause to combine with oxygen,-2 Chemistry cause electrons are lost to another substance or molecule. "In another words" The milk develops a flat taste and loses vitamin C..