Serums for Hydration?

Hello all, I need to plump up and hydrate my skin in the next 2 months for a big event; my current BR VIP creme 02 is unfortunately not hydrating enough for me and I ran out of Sturm Vitamin C (which didn't really do anything for me). Any recommendations for great HA and/or antioxidant serums and good moisturizers for day? I tried purchasing Skin Better Alto and Trio on their site but was unable to register despite numerous tries, so I've given up on that! What else is great that's out there? I'm open to department store lux brands as well as medspa brands. TIA!