DIY Edible Water Bubbles and Other Round Food

Inhabitat – a weblog showcasing innovations in sustainability – presented an ingenious alternative to wasteful water bottles this week, posting a video and step-by-step instructions for making gelatinous water bubbles by using spherification.
Introduced in 2003 by chef  Ferran Adrià, spherification is a molecular gastronomy technique in which a gel membrane forms around a calcium-infused liquid when that liquid is submerged in a bath of sodium alginate. The video shows how it can be done at home with water and other commonly available ingredients.
Serious spherification cooks can find a spherification course and molecular gastronomy kits at MolecularRecipes.com. The site also lists other spherification recipes and techniques for making edible foams, films, ashes, crystal bread, and flavored snows.