Sunstar,
Honestly, I don't really trust medically prescribed or chemical solutions for either constipation or diarrhea. Some of us react in the opposite direction to the drug. For example, I get hard stools or constipation using Loperamide HCL pills (as do others). Similarly, someone else on this forum posted they get diarrhea using Linzess, which you seem keen to using. So people end up cycling between the two states of diarrhea and constipation..Chemical solutions and dependence of chemicals for long-term control of a human muscle that should be moved almost daily doesn't sound like a good long-term, safe, healthy solution.
It may work short term..
In any case, the Renew Life Cleanse more should be available at a whole foods or vitamin shoppe. They are usually cheaper online, and at online health food stores, but given your urgency, you may just want to go in person. Don't trust me, the reviews themselves look as promising as any good product can be (above 4 stars on almost all websites among thousands of reviews).
Best of luck!