If you still have the bottle you could probably still get quite a few more super trips out of it by taking a spring water bottle cap, adding 20 drops of distilled water to it, swish the dropper tip and screw-threads in it and sucking it back up into the bottle. Then you could lick the threads and trip your balls out through your nose, then use the drops for later. There is a lot of buildup on the tip and a LOT in the cap of the dropper bottle too!
P.S. It's very important to use distilled water. If you used tap water the first time you tried it, you're lucky you tripped at all. Chlorine breaks down LSD almost instantly. That reminds me of one time......
My buddy and I were taking an empty bottle and sucking spring water up into it and dropping the result onto our tongues. We were tripping really hard. we ran out of spring water so, being the tripping fool that I was, I went downstairs to the bathroom and used some tap water. After that we did not trip any harder than we were before. BUMMER! If we had kept using spring water, I believe we would have been part of the background radiation by morning!