So, once shown how, Peter was always able to walk on water ?

[ErGingerbreadMandude]

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Right ??

After Jesus walked upon the water to the boat with the disciples, and Jesus called Peter to join Him, and Peter gave it a go, and after a little problem with wind and doubt, Peter got the hang of it totally, and

for the rest of his life, he was always able to walk upon water  !!!

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If I were able to walk you through the white house with my security clearance once to meet the PotUS, do you think you'd be able to come back when ever you wanted and meet him on your own?

I would be able to do that.
By asking you to come along with me.

The problem with that example is that you assume something that Jesus was able to teach Peter to do would suddenly be forgotten by Peter without the presence of Jesus.
That's like saying you got inside the white house and suddenly spots an old friend and chat up with her momentarily completely forgetting about whoever bought you inside White house only to be surrounded by Black Ops for trespassing - which you didn't.
If you were right whilst saying that it is Jesus's presence which enabled Peter to perform said miracle then he wouldn't have had trouble walking on water whilst still being in presence of Jesus by getting frightened by the wind and tides.