i have done many like them till now and in use over years ;;the gift pack and juisce crusher is fab ; my house is full of plastic reusable coverts and concrete filled bottles serve as concrete bricks ans can be cemented too to create wall;
You can also make holes in the between of the bottle and pour water when turn the lid nice and tight the water will stop pouring out and if u make the cap lose the water will pour out. It is called a bottle sink