Start With the Kitchen Cabinets
The kitchen is one of the easiest places for unnecessary items to accumulate. Start with those extra water bottles and travel thermoses. If your cabinets are filled with bottles that rarely leave the house, keep the ones you actually use and consider getting rid of the rest. Then check your spices.
That jar you bought for one recipe three years ago probably doesn't need to keep occupying prime cabinet real estate. Check the dates and remove anything that's expired or unlikely to be used. And then there are the mugs. Somehow, mugs seem to multiply. Gifts, souvenirs and impulse purchases can leave you with an entire shelf full of them.
Ask yourself how many you realistically need. A simple “one in, one out” rule can help prevent the collection from growing again. When a new mug comes home, an old one leaves. You can also look at mismatched food containers, missing lids and dishes you never reach for. Your kitchen doesn't need to contain every item you've ever purchased. If you never use it, it's probably taking up space for no reason.