Need Help rescuing my cray fish

[Fish Fanatic34]

Hey guys I have recently got 2 small crayfish, they each have there own 20 gallon long with a deep gravel and sand substrate mix, last night my best looking one escaped. It would of been after 10pm and I found him on my couch at 6am, he was in a blanket that had a water bottle spilled during the night. I now have in a container and am slowly adding more water every 30 minutes until he his covered. What is the best approach at saving this little guy?

 

[Fish Fanatic34]

Also I have a lid on the aquarium and there is now gaps, I'm thinking he pushed the lid open? I checked water parameters and everything is fine 0 amounts ammonia and nitrite and around 5-10ppm of nitrate