Passing / Storing UTM Data

Hello - I am looking for help accomplishing these three tasks for a few different websites. 1) Perpetuate UTM data across a visitor's visit to a website. Wherever they go. I would like to know the original lead source when they eventually opt-in using a form. 2) When the person opt's in - their lead source information (UTM data) will get input into a Gravity Form or Contact Form 7 (in WordPress) or on in a form using Zencart. 3) If the visitor never ends up taking a conversation action (filling out a form), this UTM data is stored in a cookie (that doesn't expire) for a future visit. I'm open to any ideas on how to accomplish the above ideas. Make sure to use my name in your bid. Otherwise, I will ignore it. Thank you for your time. - Shawn