Get your own injecting equipment from your local needle exchange. Injecting equipment means needles, syringes, water, spoons, filters and any other aspect of injecting paraphernalia.
Use your own equipment once only and dispose of it carefully
Don’t lend or borrow used equipment to or from anybody (including sexual partners).
Don’t inject alone. Try to do it with other people around, and try to make sure you all know what to do in an emergency.
Viruses can also live in snorting equipment e.g. straws. Don’t share these when snorting your drugs.