Dehydration in elderly and the consequences

I`m making a poster about dehydration on elderly, where I`m going show how dehydration can lead to falls (due to low blood pressure and dizziness), confusion, headache etc. I`m gonna use this text as a guide to explain the poster and I will have to submit as well, that`s why I need the references. Its important to keep the vocabulary as simple as possible as the poster and the explanation will be directed to patients and carers. It`s essential to quote the NMC, Nice and others sources from United Kingdom instead of US sources.