Have any solo travelers booked a shared water taxi/shuttle from the airport to Venice?

These are third party vendors. They could accept your reservation and cancel the night before if they have not found anyone to accept your business. Perhaps ask your landlord this question. They may have a "cousin" who could help you out.
Perhaps, join Venice specific Facebook groups. You could post your question there, where you'll find real-time, on the ground info.
Good luck, and enjoy Venice!

I'd just take the Alilaguna, they work just fine.

The regular land bus (or taxi) to P. Roma and the vaporetto from there works very well also. Not only is it much cheaper, there isn't any need to set up anything ahead of time.

Nothings tops a private water taxi for arriving in Venice for the first time. So splurge if you’d like!

But otherwise I agree with TC’s advice, and that’s exactly how I managed my arrival last week.

We have used the shared water taxi, without reserving in advance, three or four times. While they appreciate reservations, they aren’t necessary, and we hesitate to reserve if our flights might be delayed. We’ve waited 10-15 minutes at the most for five or six more people (solo travelers included) and we walk as a group to the docks. Their desk is in the airport’s main arrival hall, toward the end near car rentals. It truly is such a great way to arrive with the additional advantage of not having to deal with bags on the Alilaguna. They also have a desk or kiosk at the train station, I believe. Have a wonderful trip!

The bus is quite easy as well. Drops you right near the train station.

I agree with cathy, arriving on the water is a fantastic introduction to Venice. A friend and I did a shared water taxi on our trip in 2016. I wanted her to be wowed, and she was. I have also arrived by train. While walking out of the station is really nice, it doesn’t compare to arriving on the water. I found a Groupon discount and it was very reasonably priced.

We were in Venice a couple years ago and we took the Alilaguna from the dock at St Mark’s to the airport. We each lifted / rolled a big suitcase onto the boat without any problems. Fortunately our hotel was right on the water so it was easy to get to the dock. If you’re staying further in and a private water taxi can get right up to your hotel then that would be an advantage but otherwise I think the Alilaguna would be fine. Good luck!

Andrea…we’re returning in September…thank you for mentioning the Groupon discount…we’ll check!

Agree with Cathy and Andrea.............shared water taxi is definitely the way to go, and very likely you would be able to join in without an advance reservation. If you travel carry-on only (as we did), there may be a little bit of a wait (as fellow passengers collect luggage), then the desk "fills the water taxi" and the group heads off to where the taxi is stationed.

It was TRULY among our top 20 most wonderful travel memories we have had (and we have been blessed with many wonderful travel experiences). The look on my husband's face as he saw Venice for the first time was precious!! Then the memories of the taxi driver giving the reminder for heads down as we went under the bridges of the smaller canals...memorable!

Granted, IF it is pouring down heavy rain, maybe not the best option.

Things may have changed, but to us, the windows on the water bus thing did not look clear, so we wondered if one would even get a decent view (disclaimer: we were never "on" the water bus for the airport run. ....so just our impression).

What is the cost per person for a shared water taxi if you have no made an advance reservation?

The Venicelink website shows 32€ per person.