How do I attach shelving temporarily?

[Wouldy]

I am going to buy some shelving from Bunnings to put up in this room. It is not allowed to be a permanent fixture. I am wondering what I can buy from Bunnings in order to put the shelving up temporarily. Keeping in mind that the shelving may be very heavy as well so will need something that is going to hold it well. I am open to recommendations for shelving that doesn't have a huge width so it protrudes out too far. It is a small room. 2 metres by 2 and half. Thanks. 

[Wouldy]

@TedBear 

Thank you for the suggestion. I will check it out once set up. If need be, I will do this. 

Wouldy