Hello and welcome
I have read your query with diligence.
justify the reasons for light headed and dizziness
can be one of the reasons. Normally a person has to consume about 3 liter of water in any form. My personal advice to you is do not miss you anti-hypertensive dose in any case because hypertension is silent killer and give rise to number of diseases. You can reduce you dose of the drug and even stop the drug if you control all the risk factors for heart disease
. Do not stop the medication without advice of your treating doctor.