There’s a small booklet circulating with a few kapitlach Tehilim &
a special tefillah for the three Bochurim that were H”Y imprisoned.
I pick one up from a local satmar shul.
it’s free. you can put it in your siddur (fits in any siddur)like by olienu,
So one can remember everyday to have them in mind.
or you can just jot their names down on a post it
& insert into your siddur so you never forget to have them in mind.