Which is suitable for famine watermelon cap or ice cap?

In midsummer, without other heatstroke prevention measures, the temperature of the characters can be maintained at about 38 degrees by using watermelon caps. At this point, the character has begun to suffer from heatstroke, and the blood is deducted (from 35 degrees).

The survival probability of watermelon on the farm is 1 1%, and there is a process of building a farm and waiting for it for a generation.