I just bought this so I could make my own fruit-flavored water. The lids seems to seal very tightly; I have not laid it flat in my fridge, but holding it on it side it does seem to have a good seal. It is very tall, but it fits easily in my fridge door. I have a standard 2 vertical door fridge, and my bottom shelf has a lot of room (I actually wedged some other items around it so it wouldn't move around when opening the door). Many fridges these days have adjustable door shelving, so it should be feasible to get this to fit.
I place sliced plum and blueberries in the water and let it infuse overnight. The resulting water has a subtle flavor that makes the water less boring (it has a great fruity fragrance, too). I am going to order one of these for my mom. I only gave 4 of 5 stars since the lid has a slotted shield instead of mesh, so smashed fruit bits could slip through. However, the blueberries I cut in half remained in the bottle.