MEMRI clip of well known Jamaican hate-preacher, Sheikh Abdullah Al-Faisal, detailing a plot against Muslims by the unbelievers to "give them cancer". More likely it is a tactic designed to get Muslims to do fewer and fewer interactions with non-Muslims at the level of commerce.
First it would help to know what Zamzam water is.
The Well of Zamzam (or the Zamzam Well, or just Zamzam; Arabic: زمزم) is a well located within the Masjid al-Haram in Mecca, Saudi Arabia, 20 m (66 ft) east of the Kaaba, the holiest place in Islam. According to Islamic mythology, it is a miraculously generated source of water from God, which began thousands of years ago when Abraham's (Ibrāhīm) infant son Ishmael (ʼIsmāʻīl) was thirsty and kept crying for water. Millions of pilgrims visit the well each year while performing the Hajj or Umrah pilgrimages, in order to drink its water.
Convicted of inciting murder of Jews and other non-Muslims in the UK:
Abdullah el-Faisal (born Trevor William Forrest, also known as Abdullah al-Faisal, Sheikh Faisal, Sheik Faisal, and Imam Al-Jamaikee, born 10 September 1963) is a Muslim cleric who preached in the United Kingdom until he was convicted of stirring up racial hatred and urging his followers to murder Jews, Hindus, Christians, and Americans.
[...] Followers: 9/11 plotter, Richard Reid, 7/7 and Flight 253 bombers
This short article from the Mirror.UK summarizes much of his beliefs and teachings.
He claimed: “Some people are so sinful, after living in Dar ul-Harb (the West) for many years, the only way they can go to Paradise is for them to die on the battlefield fighting for Allah.
“When you go to the battlefield and you kill the kuffar (non-Muslims), they shall take your place in the hellfire.”
The Sheikh's views are well rooted in authentic Koranic teachings:
In terms of not dealing with the "kafirs":
Quran (5:51) - "O you who believe! do not take the Jews and the Christians for friends; they are friends of each other; and whoever amongst you takes them for a friend, then surely he is one of them; surely Allah does not guide the unjust people."
Quran (5:80) - "You will see many of them befriending those who disbelieve; certainly evil is that which their souls have sent before for them, that Allah became displeased with them and in chastisement shall they abide." Those Muslims who befriend unbelievers will abide in hell.
In terms of killing unbelievers and receiving rewards from Allah for having waged jihad against the unbeliever:
Quran (4:74) - "Let those fight in the way of Allah who sell the life of this world for the other. Whoso fighteth in the way of Allah, be he slain or be he victorious, on him We shall bestow a vast reward."
Quran (9:111) - "Allah hath purchased of the believers their persons and their goods; for theirs (in return) is the garden (of Paradise): they fight in His cause, and slay and are slain: a promise binding on Him in truth, through the Law, the Gospel, and the Quran: and who is more faithful to his covenant than Allah? then rejoice in the bargain which ye have concluded: that is the achievement supreme."
Quran (2:207) - "And there is the type of man who gives his life to earn the pleasure of Allah..."This would not be in the Quran if it were not permissible.