The Graymoor Ecumenical & Interreligious Institute has prepared a very useful set of prayers which can be said day by day during the Christian Unity Week. I recommend it most especially to parishioners. – Fr. Peter

https://geii.org/week_of_prayer_for_christian_unity/prayer_worship/daily_scripture_and_prayer_guide.html

Other resources:

http://www.christianunity.va/content/unitacristiani/en/settimana-di-preghiera-per-l-unita/en.html

https://www.oikoumene.org/events/week-of-prayer-for-christian-unity

Week of Prayer for Christian Unity 2021