this is the blind leading the blind. If you really want help send me a pm with some info about your business, in regards to cash flow timing and lines of credit in both currencies. You need to consider a lot of factors to come up with a good plan
One option would be to lock in a rate today using a forward. If you are a business I maybe able to help. Send me an e-mail.
The solution is easy. You are obviously worried about the CAD dropping during the next 3-6 months so you must SELL the CAD now to lock in todays exchange rate. What part of that don't you understand?
First you said I need to buy CAD now. I can't afford to do anything about this so it is no longer an issue anyway.
MasterAtWork was correct when he noticed my mistake but it should have pointed you in the right direction and got you thinking.