There’s a great site here with instructions on how to make your own masks – note that their recommended patter is ‘Clover‘ – just click on the word ‘Clover’ at the top of the page to be taken to the instructions.
If you live in the Hamilton area, here is information on where you can get supplies (leave them a message – they check their messages daily):
Discount Fabric Mart
317 Ottawa St North, Hamilton, ON
Work 905-549-2293
Cell 905-531-1344
Email: discountfabricmart@gmail.com
If you’d like to see information on how effective home made masks are, see here.