getting back into the water after a month off

HI Gang! So, I accidentally had a month out of the pool...and boy do I stink now! It's really too bad 'cause I was cranking out those 200's and 400's like nobody's business. Now I feel as though I could drown on a 50! Do you guys have any advice on how I can get back to speed? Spanks! er I mean, Thanks! Jerrycat :D