I recently was about to have a week before I could get my good coffee, so I went to the grocery store and got some of theirs.
Unfortunately, I pulled the lever and got way more grocery store coffee than I could ever need.
It's also terrible. Short of tossing it, is there anything I can do to make it taste better until I get good coffee again?
Cold brew it! Make sure you start with very cold water and a coarse grind. Cold-temp chemistry has a better chance of taking what's good and leaving what's bad.
If you're wanting ideas that don't include brewing, I would suggest using the coffee grounds as a steak rub or placing the coffee in a compost pile (if you have one).
Also, there are a number of coffee desserts that are sweet enough to hide the taste of bad coffee. I would suggest giving those a try. Some examples would be a mocha fondue, java pie, or layered mocha cheesecake.
If you drink alcohol, you could also try making Kahlúa. Soak coffee beans and vanilla beans in vodka for a while (3-4 weeks), then mix with a simple syrup. There are plenty of detailed recipes on the web for it.
Use them for decoration:
Fill a glass vessel with the beans, stick a candle or tea-light in.
Looks neat, costs nothing extra and if you use a tea-light, the heat of the light will help disperse the scent of the coffee. Replace the beans occasionally.
I have done this in various scales, from tiny coffee-cup-sized arrangements (coffee table for two) to 1-quart glass vases with block candles or small pots of grass where the beans hide the plastic pot (table decoration at a wedding).
This image is from pinterest (source is in the image) as I don't have an own one at hand, but shows exactly what I did:
Ground coffee works well as an odor reducer. You can place it in a sachet or, more simply, in a bowl in the back of your refrigerator to help reduce/eliminate unwanted odors.
Try a highly-enriched coffee-drink (with sugar, cream, etc.) like a latte or perhaps Vietnamese-style iced coffee with sweetened condensed milk.
As you note in your comment, neither of these are usually my style, either. However, it's a fun change every once in a while. These are what I do when I have a batch of beans that I don't like; it covers up some bitterness, over-roasting, and other off-notes... and since I wouldn't usually consider doing this to beans that I actually like, it's merely opportunistic. :)
Mocha cheesecake is already mentioned by Devon. Also, desserts as a category. But, I would like to mention tiramisu separately as it is widely known.
If they are whole beans, place a layer on a cookie sheet and put them under the broiler for 60 to 90 seconds to wake them up. I've sometimes had a good result.
This won't fix the coffee but it might not taste as bad. Do a normal french press but do a crazy strong ratio like 1:10 1:7 or 1:5! Filter, then pour some in a cup, maybe half a cup and dilute the rest with hot water.
It won't turn it good but will make it slightly more acceptable than before.
