Make fruit last longer in fridge? I am single. When I buy strawberries or blueberries they don't always last until I get to eat them. Would they last longer kept in water? (in Tupperware)

I know strawberries can be frozen in syrup. I don't want to do that. I sometimes make muffins with half the blueberries just so I can eat them all.
No, they won't last longer in water. Fruit freezes very well without the need for syrup, and can be defrosted quickly simply by running cold water over it. If you're baking with it, you can just bake with fruit still frozen.