The width of the black tape is 1 cm, and I believe they used the DYMO black tape that they used for other BTTF props inside the car, and then tacked white lettering on top of the tape (there were no thermal printing label makers then). So I am on the hunt for adhesive lettering that matches the prop, in a range under the 1 cm mark.
Thanks for the praise
This is actually rather easy to do.
You could do it in Photoshop - but I'm using Linux, so I'm doing it in "Gimp" (which also exists for Windows and it's free).
Create a new document - if you want to print this as 6"x4" in 300dpi, make it 1800x1200 pixels.
Add two more layers (so, together with the base layer, you have three).
Make the base layer white.
On the next layer, add the colored rectangles (the backgrounds for your labels).
On the top layer, with the text tool, insert the text that you want (setting the right font, size, and color).
export as .jpg (in high quality, 90% or higher) and submit to Walgreens...
Of course, you need the right font - so search for the free fonts: "Eurostile bold extended", or "Microgramma bold extended" and install before starting Gimp.
As usual: Once you manage to work with a new tool, you will find applications everywhere.
I love this method. It's really inexpensive and the results are great (when printed on glossy photo paper) - just make sure they don't get wet
Here I used this method for more complex stickers - and the results were great, again: