4 Answers

 I recycle most of our plastic bottles. 

Examples here: http://www.designrulz.com/product-design/2012/11/45-ideas-of-how-to-recycle-plastic-bottles/

Images here: https://www.google.co.uk/search?q=how+to+recycle+plastic+bottles&espv=2&biw=1299&bih=618&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjc-6276frMAhVEAcAKHVSbDvgQsAQITw&dpr=1

A plastic bottle for a baby? Or a plastic sports bottle? Or a plastic bottle already filled with water, juice, tea, soda?  Or the redemption value of recycling?  Or the deposit cost?

If you could be more specific, we could help more.

....depends on size and function.

Check it out here as I assume you mean cost as in environmentally ...

According to the plastics manufacturing industry, it takes around 3.4 megajoules of energy to make a typical one-liter plastic bottle, cap, and packaging. Making enough plastic to bottle 31.2 billion liters of water required more than 106 billion megajoules of energy. Because a barrel of oil contains around 6 thousand megajoules, the Pacific Institute estimates that the equivalent of more than 17 million barrels of oil were needed to produce these plastic bottles.

LINK >>>http://pacinst.org/publication/bottled-water-and-energy-a-fact-sheet/