I'm not single, and I've never in my life finished an entire pack of grocery store grapes. And they are NOT fucking cheap. I haven't bought them in fuckin' years...
Edit: Oh... Wow. I now remember watching a weird movie about Jack the Ripper and thinking "how is he luring these girls with grapes?!" I guess we're back to the 1800's now...
I miss those, when I was small we had a local store that did that for all meat products. You just said X amount of bacon. Instead of buying a million separately packaged packs that barely last 1 family breakfast. Or well, going out of my way to hit up lidl, because they're like the only ones selling bigger packs.
Now don't get me wrong, butcher counters still exist, but they're rare and many are expensive hipster shit.
You can put bread in the freezer and it will keep extremely well. Absolutely avoid putting it in the fridge though.
You can then let it defrost naturally, or, if you slice it before freezing it, take out a couple of slices and put them in the toaster, after a couple of minutes is done, warm, and slightly toasted.
For grapes, since they're sold by the pound you can just take some of the grapes from the bag and place them into another bag of the same veriety if it's too many