How Much Do We Need?

This weekend as I was putting away the items(food & "other") from my weekly shopping trip, I realized something that might help me to know how much to buy to have my year's supply. I have a good handle on the food part but its the toiletries that I'm not prepared on the quantity. Things like: handsoap, deodorant, q-tips/cotton balls, bodywash, toothpaste, mouthwash, dish soap, cleaners, toilet paper, etc. . . So I decided to put the date on an item when I open it then when its gone I can do my calculating for the year & buy accordingly. I love using coupons but if I don't need to stock pile a certain item because it takes too long to use it, then I've just wasted money that could have gone somewhere else!