What do I use since I lost my mascara wand?

Since you lost your mascara wand, I recommend that you buy a new mascara. Mascara can attract germs easily, and without a wand (and presumably the cap) this problem will likely be worse. If this is a newer mascara, you can apply with a liner brush or wash off the wand from a cheaper mascara (such as a $1 option from the discount brand sections).