The overall costs of each part for 1 water bottle rocket are as follows:

• Polystyrene nose cone – £3.75
• Bike valve – £3
• 2x 2L bottle – £2
• Super glue – £1
• Tape – £6
• Bottle cork – £0.30
• Card – £1.80
• Total Cost – £17.85

Also needed

• Bike pump
• Water