Some families or educators cannot find enough bilingual books for very specific reading levels or story interests. In that situation, you can create your own bilingual version of a story.

The easiest method is to buy a Spanish edition of the book you want to use, then translate each sentence into English.

If you are bilingual, you can translate the text yourself. If you don't speak Spanish, you can use an automated machine translation, even just to be able to understand the text yourself and retell it in English.

It is always better to translate from Spanish to English rather than translating English into Spanish using a tool, because machine translation into Spanish often makes mistakes with grammar, verb forms, and vocabulary that could confuse the child. 

Creating a clean English translation from an authentic Spanish edition preserves accuracy while giving you the bilingual structure you need. And if the English translation sounds a bit unnatural, since you speak English, you can easily correct it.

Another option is to read free stories in Spanish online and use a browser extension like Google Translate to translate the entire webpage or one sentence at a time into English as needed.