Watering question for newbie!! With Pics

[Fumi Lai]

First of all I want to thank the members who have helped me to try to safe my baby phal on death road. It is now in a bag and hope the keiki baby will hang in there.
Anyway, I have another phal which I got 2 weeks ago, still nice and healthy but I do have some concern about watering it.
When it first arrived at home the leaves were more stiff and pointing more upward, but now it is sagging down. I searched some forum and though I underwater it so I gave it another cup of water only 3 days after I last water it. According to the forum, if that was the problem, I should see immediate improvement. But this is day 5 now it is still down~~~~~ not getting worse I guess, but should I be concern?? Please see attached picture. Is it normal or it is sagging a bit?
Another question is, usually when I water it I just use a little cup and pour it over on the sink. But when I see some video and also some website, people are POURING like 2 liters of water or just let the tape run over the phal! Of course most water will drain but I am so afraid of overwater since what happened to my other baby phal. The potting medium of this Pahl is a mixture of bark and soil I think. So, what is the correct way to water it to make sure I am not under or overwatering it?
Thank you very much!!