My solution for weekly meal planning. Each Sunday, plan out your week. Check through your pantry for items you need or don't need, create your grocery list and shop accordingly. It'll save you money as you are buying what you need, you won't have to go back to the grocery store continually during the week wasting gas, and you'll always be prepared!
Use my handy sheet and keep it in the kitchen. I always put mine on the refrigerator so I'm never at a loss!