For papayas, too much water is harmful, that is why I had told you about drip irrigation, or as you had been doing, watering them in the morning and in the afternoon but few amounts. I'm very sorry about the situation. On the other hand, if you can get an organic compost, I think it would be good for them, or watering them with your own urine dissolved in water is a good alternative. I hope they recover. Greetings.