Yes. Pantry substitutions recur throughout the book, and when no suitable ingredient is available, plain water can replace it. The ritual's structure, including the stated intention, the prepared water, the pour, and the practical close, does the meaningful work.
The book is careful not to make universal safety claims in either direction: substitutions are offered as practical flexibility, not as advice that any ingredient is safe for everyone. If an ingredient is unsuitable for you, the recipes treat its absence as normal, not as a failure of the practice.