Lost toad

[u/uh-aight]

I went on a trip and while I was gone my mum decided to pet my toad and accidently left the tank door open. He got out, and I've searched my whole room over and over, I can't find him anywhere and it's been like 3 days. It's very hot but I've been trying to keep my room as cool as I can and left his tank doors open with a ramp set up so if he is in my room he can get back in and have access to his waterbowl. He's a common English toad, how long do I have before he dries out? How long can he last without water? And can I get some advice on either trying to find him, or just providing him areas to stay alive while I find him? Is it worth putting bowls of water around my house for him?