How to synthesizer Acetic Anhydride to make Herion( Black Tar) ?

[tar99]

Hello guys new here,
I want to make heroin from morphine but i don't know how to make acetic anhydride.
Any easy way to synthesize it or any other alternative for acetic anhydride?

 

[WillD]

Acetic anhydride (click)

 

[woohoo]

Acetyl chloride can be used instead.