oh my god I just cringed incredibly hard at the thought of trying a 6000 km tour on a canadian tire bike. The budget of 3000 CAD for the bike itself before accessories is a possibility, but I advise you to get information from specialty bike shops that focus on road bikes, and ask them about good touring bikes.

for the americans: a bike sold at canadian tire is often a $195 "bicycle shaped object" similar to what you'd see for sale at walmart.

some useful info on touring bike frames and components:

https://www.rei.com/learn/expert-advice/how-to-choose-a-bike...

https://www.cyclingabout.com/best-touring-bikes-you-can-buy-...