Pour sugar, corn syrup and water into saucepan. Cook, stirring only until sugar is dissolved. Continue cooking until sugar begins to turn light brown (300 degrees) by candy thermometer. Remove from heat. Add salt, soda, butter and stir as little as possible, only to mix well. Stir in peanuts and coconut. Spread on a greased sheet of waxed paper set on top of a baking sheet and let the mixture cool and harden.