What is the method for writing Quranic verses for healing, and is it permissible to write them without diacritical marks (nuqat), or with connected or separated letters?

It is permissible to write Quranic verses without diacritical marks (nuqat) or vocalizations (tashkeel), as the Companions did. However, it is not permissible to disjoin letters or separate words that are originally connected, or to connect words that are originally separate. This is because it involves distortion and alteration of the meaning, and it goes against the established Uthmanic script of the Qur'an, which is unanimously agreed upon as obligatory to follow.