Those are in the treaty. India paid around $5 billion in today's money. A simple google search would give you the data. And our leaders were stupid enough to pay the installment even after the 1965 war.
IWT is the most liberal water treaty in the world. An upper riparian country only needs to give 50% of the water that's the law everywhere in the world. India signed this treaty hoping that this would forgo the concerns of India blocking water to Pakistan and hence the claim to Kashmir by giving 80% of the share and paid for new irrigation systems and canals, not just India, the US gave you cheap loans, some western countries also gave you grants.
Don't know what happened to those funds.
Pakistan wastes most of this water, despite your dire need you haven't done enough to tackle water scarcity, and your forest cover is rapidly depleting (worst performer in deforestation). You give permits to hunt exotic animals which is a total disregard for the ecosystem.
I'm not claiming a moral high ground, water issues and desertification affects Indian western states too.
PS : This news by Pakistan is some wild conspiracy theory, as government clarified about this news, India has no interest in altering the IWT, these op-eds are attempts to divert attention from the real water scarcity issues that Pakistan face due to its own mismanagement not because of India.