A lightweight single man tent would be much more substantial, such as

http://www.outdoorworld.co.uk/aztec-rapido-tent-p-38.html

The modestly priced Aztec Rapido weighs in at 1.6kg but gives lots of space, protection from the elements (wind and heavy rain) and some privacy. Lighter weight single man tents are available just around the 1kg mark but are somewhat more expensive.



A more substantial water filter could prove invaluable in an Earth Quake situation, such as the Lifesaver bottle as long term potable water might not be available for many weeks.

http://www.lifesaverbottledirect.com/

3 Esbit tablets although very lightweight will only boil around 1-1.5 litres of water. A gas cartridge stove and pot systems such as

http://www.planetfear.com/articles/The_2009_Mountain_Marathon_Kit_List_1037.html#csp

will allow approx 10-15 times the volume of boiled water for an additional 250-300 grams weight.

Perhaps throw in a couple of these into your GHB

http://www.mysupermarket.co.uk/tesco-price-comparison/Spirits/Greenalls_Gin_And_Tonic_250ml.html

Helps you relax after a potentially very stressful day.