There are so many ideas for recycling plastic in our gardens, the truth is really that we should never have become so dependant on this convenient product. Not all plastics can be recycled, trying to reuse as much as we can, rather than landfilling it, is important.
We can use old plastic bottles as mini greenhouses, over individual seedlings, you can even go so far as to make a PET bottle greenhouse. However, that idea is not so practical here, with our strong winds and hot summers. One idea that does appeal, and to me is practical is a vertical garden. In our region it isn't just about space, but also about being able to keep favourite plants alive during cold months. This picture is from Sao Paulo where a design team created a vertical garden against a wall. The garden features both herbs and flowers, you can grow what you like.
Find a section of wall that's a heat sink, you can track the sun and consider the materials used to make the wall. Brick and stone will retain warmth, metal or wood will cool quickly. A heat sink wall means you can enjoy basil for longer, being a tropical plant it hates the cold. There are probably lots of plants to keep going over winter, or you can have this garden close to the kitchen for easy harvesting.
I prefer the idea of the bottles lying horizontally, as I think it provides a more secure planting medium. good luck and have fun, most of all enjoy the produce. With the bottles not being connected, a hose is needed for watering.
This is not the plan for the garden pictured, but should give lots of good ideas.