How can you improve spelling when you have aphantasia?

Most people when they look at words and see word at least three times it goes into their long term memory. And when they close their eye can see the word. The person visualize the word after seeing word at least three times.

How can people with aphantasia improve spelling? Are there other ways to teach spelling or tricks. 

People with aphantasia when you look at word even a very simple three letter word you learn in like in first grade like Bat or Cat and close your eye you see nothing. How can one improve spelling when you have aphantasia?