TO WARM THE SOUL In a season when nesting is in vogue, the faux mink-covered hot water bottle ($90) may wind up under the Christmas tree. It's new from the Ernest Hemingway Collection. (What would Papa think?) Where: In cosmetics at Zitomer in New York City. Leave it to the Canadians to come up with sheets that give a whole new meaning to self-help. Lusty Linen is a line of bedding with printed instructions, including some sketches from the Kama Sutra, the love guide from ancient India. Prices: $139.99, to fit a double/full mattress; $159.99 for a queen; $179.99 for a king-sized set, plus shipping. To order, go online to: http://www.lustylinen.com, or call 1-877-94-LUSTY.