Thanks! So for the quarantine at London airport the supervisor said " do you have a place to stay there ? " We simply said "yes we do". When we (as everyone else) landed inToronto we were welcomed by police men very serious lol that said " welcome: Do you realise that you have to do 14 days quarantine?" Again we simply responded "yes we do" then they handed us over a covid 19 /quarantine leaflet. Behind them they were tables with quarantine forms and pencils ...we were all required to complete the quarantine forms. On the forms you need to confirm where you are coming from and what will be your address for the quarantine. Only after this you keep your completed form and can get to the queue for immigration ...there you give passport and the custom forms ( that you must have had more than enough time to complete on the plane) and once you say you have a PR confirmation letter the officer will cross the custom doc with a hilighter and give it back to you. Then you will need to go to a second immigration desk ( where you will get your COPR letter and everything stamped...) ...And it is on your way to that second immigration desk that you will be required to drop your completed quarantine form in a box...and that is it
In regards to the transit and connection. At the stage where you complete your quarantine form there are also agents that ask you if you have a connection flight. We did not go to that queue because we did not yet have a connection flight then. However, I think you will not be able to go to that queue either as you will need to go to complete your immigration PR landing first. However the best would be to ask the agents ...better be sure. I don't recall that the quarantine form asks you to confirm how you are planing to get to your destination address (neither how long it is supposed to take you ) it however asks you to confirm precisely what will be your address ...and in which province and so on...now no one reviews the form you completed before you drop it in the box...so you should not get further questions about your itenary details and plans. I would recommend to just honestly complete the form and only provide the required details.
We hired a Uber from the Ottawa airport to our accomodation. The driver was wearing gloves and mask. At the Toronto airport before we decided to get a connection flight to Ottawa, we also got a quote from a taxi to drive us to Ottawa. The guy was literally waiting for clients and offered. It is also possible to rent cars at the airport if you wish to.
For the groceries we used Walmart.
https://www.walmart.ca/en/grocery/N-117
They do delivery and pick ups. Unfortunately they could not deliver at our airbnb address this is why we arranged a pick up. We asked our Airbnb host if he could kindly collect it for us since we knew we could only go straight to the accomodation and not stop anywhere else on the way. But you may be luckier and get a direct delivery at your accomodation address. Just try to put your address on the Walmart website and you will know instantly. Please note that walmart only accepts Canada phone number and us/Canada credit cards. However they do accept paypal this is what we used to book our slot and pay for our order from the UK and our airbnb host accepted we put his mobile number down.