Put the vial in a thermos. Put the thermos in the freezer.
[Edit]: I've never stored LSD in liquid form, so I don't know if it would freeze in the freezer (don't think it will, but don't wanna screw your vial up), so you could also put the thermos in the fridge and it would probably last till July 3 as well.
"Science without religion is lame. Religion without science is blind" - Albert Einstein
"The Mighty One appears, the horizon shines. Atum appears on the smell of his censing, the Sunshine- god has risen in the sky, the Mansion of the pyramidion is in joy and all its inmates are assembled, a voice calls out within the shrine, shouting reverberates around the Netherworld." - Egyptian Book of the Dead
"Man fears time, but time fears the Pyramids" - 9th century Arab proverb