Pls show us the whole plant, its pot & soil. Hard to diagnose from just that bit shown.

Sorry to say, but a cup of water gives us no idea how much water to how big a plant, that's not useful. (A cup can hold any amount, tho' technically speaking a measuring cup = 8 oz.). Water 'til it comes out the bottom, that ensures it's gotten all the way thru the rootball & given the plant enough water.

Good advice! More pics would help.

But, don't water again until the soil is dry and the plant needs it. You can check soil moaiture levels with a chopstick or a wooden dowel (1/4" is good) sharpened in a pencil sharpener.

You would enjoy this thread, it's helpful.....

Good Growing
Practices - An Overview
http://forums2.gardenweb.com/forums/load/houseplt/msg101400289284.html

If these symptoms are manifest in only
one or two leaves, I'd feel fairly confident that you're looking at
mechanical injury. Waxing anthropomorphic for just a moment - mechanical
injury would be the rough equivalent of bruising in a human. What look
like scabs along the midrib appear to be callus tissue that forms after
wounding. It looks like the leaf was accidentally scraped across an
object or an object across the leaf to create the wounds. If it only
occurs in one or two spots, keep an eye on it, but don't obsess over it.

Without the support of the midrib and subordinate venation, the
leaf of a Ficus lyrata would be about as strong as 20 lb bond typing
paper. So they play a part similar to the metal ribs that support an
opened umbrella - they add strength that helps leaves keep their shape.
When subjected to deflection (bending) the leaf isn't able to tolerate,
the midrib and/or veins can crack - like a piece of celery, e.g.. My
guess is that's what happened to cause the other injury in your 2nd
& 3rd images.

It's really difficult to diagnose something from a distance,
especially w/o seeing an image that better helps to assess your plant's
o/a level of vitality. I should probably say that I reserve the right to
change my mind re what's going on if an image showing the entire were
to reveal anything that can't be seen in the tight shots.

If you have interest, you might gain from looking at something I wrote about Growing Ficus in Pots.
It was originally written when Ficus benjamina, the weeping fig, was
garnering the lions share of the attention; but the cultural preferences
of lyrata are so like benjamina that I could simply change the title
and no one would ever notice. On the off chance that you find what you
find at the link to be of value, I've written a more in depth piece
about growing trees in pots that I think you'll find very helpful if you
think that by becoming a more proficient nurturer, you increase the
personal rewards you get from your growing experience. Let me know ....

Al