What kind of coolant should be fill the tank of Hybrid?

No different than other Toyota's below is the recommendation from repair manual. We mix coolant with distilled water with a 50/50 mix. Coolant type: In order to avoid technical problems, only use "Toyota Super Long Life Coolant" or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology. Do not use plain water alone.

Probably should go to the nearest Toyota dealer to avoid problems. May cost more than aftermarket initially , but less costly than a mistake costing a lot more down the road?