No coolant in reservoir

I have recently discovered that my car has very little to no coolant in the reservoir, even after filling it up. I’m not noticing any leaks, and my car has not overheated. I do notice that there is some white smoke when I start my car some mornings. I’ve also recently been told that my EVAP canister needs to be replaced. Do these things go hand in hand or are are they separate issues? I was given a quote of $960.00 to replace the EVAP canister alone. The shop didn’t even address the coolant issue, just kept talking about the EVAP canister. I don’t have much knowledge about cars. Thank you in advance for your help!