All the best organizational methods call for you to find a place for every item in your home. Yes, "the cabinet" counts, broadly, but even that can be improved upon. Even though you don't see it all the time, having the insides of your organizational spaces, well, organized will make it easier to access the things you need when you need them. These tools should help.
Tools for organizing kitchen cabinets
Let's start with your kitchen cabinets, where you probably have plates, dishes, cups, and other cooking implements stacked up. First, you need basics. These will help you stack your plates and other dinnerware higher and give you more space overall.
The Songmics stackers above are nice to look at, which is a nice bonus, but for $14.99 you can also get more standard white ones from Amazon Basics.
For snacks or smaller items, get a few containers with dividers inside. This will also make it easier to "decant" everything you buy (which is super helpful for staying tidy).
A few others to consider:
A set of four stackable storage drawers that can be used for snacks, utensils, or other small items ($25.97)
An organizer designed just for water bottles, which holds 16 of them ($21.99)
A pull-out pan organizer that stores your pans horizontally and makes them easy to access ($19.54)
Two racks that clip to the inside of your cabinet doors to hold your pan lids ($12.32)
Finally, don't overlook the value of lazy Susans. Turntables are extremely useful inside cabinets and even on your countertops, as they enable you to store items from front to back, but spin everything around so you don't have to dig through products to get what you need in the back. Here are some great ones to use in every room of your home.
Storage solutions for under the sink
In addition to a big old turntable, you have a few options for organizing the chaos that typically unfolds in the cabinet under your sink. That's usually where people keep bigger items like cleaning supplies, so try these tools that are designed to keep those in order.
You can use standard, tiered racks to keep everything in order. This one from Ceetug has an L-shaped design and the top rack is good for sponges and smaller items while the bottom one, which pulls out, works well for bigger bottles.
If you have more bottles than that holds, try a bigger version, like this one.