Hi Nick Renaud-Komiya,
YOu can add this css on chidl theme style.css or additional css section of customizer. So your changes will not lost on theme update.
body .entry-content p {
word-spacing: 10px;
line-height: 27px;
}
Note: Please increase/decrease the word-spacing and line-height value as per your requirement.
You can see here for more information about spcing : https://www.w3schools.com/cssref/pr_text_word-spacing.asp
Thanks