Sorry to hear about your problem.
You should boil 1/2 C of malt in 2 cups of water. Let it cool to room temp add it to a large beer bottle, add your yeast (room temp) and an airlock.
Let it sit for about 12 hours and see if you get any activity, bubbles on the top, gurgling in the airlock, yeast on the bottom of the bottle.
I have over a case of clear glass .5 liter flippy bottles that I use for yeast. Being able to see the yeast activity is a bonus over brown glass.
If you don't get any activity then your yeast is probably a loss. Don't toss it though. Buy another one and add the mixture. No need to waste anything that expensive.