Q. Have a Happy Yom Tov Rabbi. If my aged father has difficulty in eating Matza, and he has to make it soft by soaking it in water.
A. On question 3100 regarding a similar case we wrote: “The Rov added that if the Matza is to be dampened with water to make it softer and more digestible, it should maintain its Tzuras Hapas or its basic form and structure.” If it dissolved in the water and one is actually drinking the matza instead of eating it, one does not comply
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If one needs to drink some water while eating the Matza, the water should be taken when there is no Matza in the mouth, between the bites. See Arzei Halvanan (108) that this was indeed the costume of Horav Moshe Feinstein Zt’l in his old age.
Rabbi A. Bartfeld as revised by Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu Shlit’a