Is there a possiblity that you can provide a link to any of those online pics? It's really tough to help, without any visuals.
Any of those cheap bloom ferts(MG Bloom, Superbloom, etc...) at Walmart, Lowes, etc...will work, if it's indeed a P deficiency. Just be careful with them, because they're all quite potent. Start with 1/8th strength, and go from there, if you want to be safe. Off hand, I can't think of any home remedies.