A man was recently lost in the Outback and survived for six days in hot conditions without any water. Many news reports are claiming that he survived this long without water because he ate ants.
Some of the reports mention that ants are nutritious, and provide information about that. But none have any evidence that ants could be a significant source of water. The claim seems to be simply based on the man's observation that he ate ants, and then lived longer than expected, but it is now being reported as fact.
I am quite skeptical that they would provide enough water to add meaningfully to survival--and misconceptions about what one should do to survive in the wilderness can be quite dangerous.