How to keep leftover stew in the fridge without it going bad

Let the stew cool completely before storing it, then put everything in an airtight container and stick it in the fridge, where it'll keep just fine for about 3 or 4 days. The key thing is keeping air away from the food, so cover it well or use containers with lids that actually seal. If you want it to last longer, you can also freeze it in portions and take out what you need when you're ready to eat.