Wow! Things have sure changed in the world of writing. I'm actually dictating this on a common laptop using something I thought I would never be doing successfully.
I recall more than 30 years ago being at one of the big computer trade shows and seeing IBM showing off their product to do voice dictation. ViaVoice required a rather brawny computer, a special sound card and extensive training to make it work Even then, I got it to be about 90% accurate, or every 10th word wrong. Correcting the text took as much time as writing, so it got put aside. Same with the completion that soon followed. Computers don't really know much about words, they just know what words often follow other words. So, with the early attempts at voice dictation, it helped a lot to let the program read everything you've written to track what word combinations are used often.
But what if your computer cataloged not only how you wrote, but how a whole bunch of people wrote?
That's exactly what Google offers in Google Docs and on Android tablets and phones. We now we offload the heavy-lift into some powerful computer array somewhere and can even dictate to a common smartphone. I use no-name $150 Android tablet to dictate into an App called Write+. Then I "share" it via email to myself for later use. Other times, I dictate into Google Docs and then just copy and paste the text as needed.
It does help that I have a background in vocal work and broadcasting so I'm used to thinking out loud. But lots of people use it and it is free. Give it a try!