With so many blooming bushes and trees at their peak, I bet you are scrambling to find enough vases to accommodate your bounty. Don't forget that a pretty pitcher (antique or otherwise) can double as a vase.
If you are considering an antique pitcher and have doubts about whether it is water-tight, you can always insert a small glass inside to hold the water. The pitcher you see here is in a pattern called "Chelsea" and the cluster of lavender blooms are fragrant lilacs from my yard- I'm in heaven.
When arranging cut flowers, I like to sprinkle a little Floralife floral food into the water to lengthen the bloom life. When I don't have any of that, I resort to a splash of Listerine mouthwash! I have heard that the "germ fighting" properties of mouthwash can also work to keep the water fresher longer. If I don't have floral food on hand, I figure it can't hurt.
So dig through your cupboards (or the basement!) and see if you can find any interesting vessels to hold this season's delight.