The only thing I’ve bought so far for Pesach is matzah. (Ten pounds at Costco for $18 – sadly, I don’t live in the land of “free after coupon” matzah.)
And yet, my Pesach box in the storage room is already brimming with brand new stuff that we’ll be using for Pesach.
Extra virgin olive oil. Walnuts. Raisins (certified OU are “P” year-round). Baking soda. Salt. Sugar. Ground coffee. Tea bags (unflavored). Cocoa. Coconut oil. Bottled water and unflavored seltzer.
And let’s not forget the dog food, tin foil, plastic wrap, baggies, dish detergent and sponges.
What all these products have in common is that they do NOT require a special KLP hechsher. And in some cases – they don’t require any hechsher at all.
There are plenty of Pesach food items that will necessitate a trip to the kosher aisle of the store, but for the ones that don’t, I see no reason to pay the mark-up.
In fact, just the opposite – I’ve been gleaning my stockpile to set aside the items I have scored practically for free with a coupon and a sale.
To know what items I can start stockpiling in advance, I rely on the OU’s List of Food Products that Don’t Require a Special KLP Hechsher (it starts on page 51 of the Passover Guide.) I also keep a copy of Non-Food Items that Don’t Require a Special Hechsher handy.
Dislaimer: I realize that minhagim vary by community. And of course, I am in no way a halachic authority, so please discuss any questions you have with your LOR.