This might be completely obvious to others, and I’m probably opening myself to ridicule, but I only recently discovered it and find it awesome. If you have dog that like to chew things, many of those fancy plush squeak toys last about a day. But if you take an empty plastic water bottle, slip in inside an old sock, and tie off the end, you now have an endless supply of free dog toys!
I did this after finding $10 “bottle buddies” at a dog store, and have already gone through three of these things in a little over a week. Removing the cap and ring helps avoid a choking hazard.