Yep, When I do small weddings I purchase them at Costco. They are always beautiful.
You could even make them the day before your event. Store them in the coolest place in your home. Away from sunlight. . DO NOT put them in your fridge! The food is toxic to the flowers and they will be dead in the morning.
You will need Newspaper, floral Tape, some of the foam double sided tape,Cutters or scissors, some of those "flower food packets" and see if your craft store sells a product called "Floralife", . . It should be in a spray bottle.
To prep for them to come home. Have ready pitchers, or a clean bucket with cool water. Get some of those "flower food packets" ahead of time and only use HALF of what the instructions suggest.
Clear off a large space and cover it with newspaper. Have your mason jars ready by washing them and making sure they are dry, place a piece of the white foam tape on each jar, tie your bows on and the tape will hold them on . fill about 1/2 full of the floral solution.. You could use the divided box your mason jars came in to transport them to the wedding.
The moment you get home cut all of the stems at an angle and place them in the pitchers or buckets with the water with the "flower food" that comes with the flowers..
Make the arrangements and place them in the jars, place the bouquets in the pitchers with the solution.
Then spray all of them really well with the Floralife. They will be perfect the next day.