Yeah at times you might end up typing something that you never intended to type.What I think you should do:
If you're using an Android phone,then you should change the keyboard to Japanese keyboard.That kind of a keyboard that uses alphaberical order. The only problem is that its always slow.
Also you can download a keyboard in the google playstore.The downloaded one's normally do not had the auto correct function.
The problem with those keyboard with no autocorrect function is that,you might miss the correct spelling for a certain word and you'll be required to go back and check the dictionary first thus wasting time.