We turned a little water bottle into a brilliant sippy cup this hot afternoon. Rowan gets bored with his sippy cups. At random, he changes his mind as to what he finds an acceptable beverage receptacle. This afternoon, this water bottle did the trick, and he was drinking out of it like crazy. I think these would be great at a toddler birthday party.
Homemade Sippy Cup
Small water bottle
Screwdriver ( I think a Phillips head worked well)
Remove top from water bottle. Force screwdriver into the top until it forms a hole. Maneuver the screw driver, so that the hole is the right size for your straw. Insert straw and screw back on bottle.