Brew Kit is just a term for some tea bags or coffee, beverage whitener and sugar sachets.

Each 24 hour 1-man ORP came in a small brown corrugated cardboard box, with the full menu listings printed on the bottom (GP A-G, H, K, S, V, P, sundries and variants). Each box contains the following:
1 x Breakfast meal (in foil boil-in-a-bag packet, encased in a sealed polythene bag for added protection)
1 x Main meal (in foil boil-in-a-bag packet, encased in a sealed polythene bag for added protection)
1 x Dessert meal (in foil boil-in-a-bag packet, encased in a sealed polythene bag for added protection)

1 x Soup, powdered form, in sachet (varying flavours; Beef & Tomato, vegetable, Cream of mushroom, etc, manufactured by "Chequer Foods Ltd")

1 x Meat Pate, such Turkey and Herbs, Chicken and Herbs, etc (in small, ring pull opening, can)
1 x Oatmeal block (A slight exaggeration! It is really just a small Oatmeal biscuit, in metallic green foil packet)
1 packet x Biscuit Browns (approximately 6 in metallic green packet)
1 packet x Fruit Biscuits (approximately 6 in metallic pink or green packet)
1 x Milk chocolate bar (usually a bar manufactured by "A. Gandola & C. S.p.A. of Italy", but sometimes a brand called "Duncans of (Bellishill) Scotland")
1 x Milk chocolate with raisins and cereal bar (usually a brand called "Duncans of (Bellishill) Scotland")
1 packet of Boiled sweets (various fruit flavours, manufactured by "Chequer Foods Ltd")
1 packet of Wrigley?s chewing gum (usually Wrigley?s Extra, but sometimes a smaller packet of Wrigley?s chewing gum in tablet-like form)

1 x Drinking chocolate mix sachet (manufactured by "Eurogran of Kalundborg")
2 x Coffee sachets (manufactured by "Chequer Foods Ltd")
2 x Beverage whitener sachets, for coffee (manufactured by "Chequer Foods Ltd")
4 x Instant white tea sachets (manufactured by "Premier Brands") - Yuck
8 x Sugar sachets (Manufactured by "Single Service")
1 x Orange or Lemon drink powder sachet (manufactured by "Eurogran of Kalundborg")
1 x Vegetable stock drink sachet (manufactured by "Single Service")

1 packet x Kleenex Tissues (manufactured by "Kleenex")
6 x Water purifying tablets
10 x Water/windproof matches with striker (matches and striker sealed in separate polythene compartments, to prevent accidental striking during packing, handling, and transportation)

Its not been unknown to carry a couple of Malt Whiskey minitures as well.

I just like the way the Sigg Bottle is easier to handle and to drink from. I find the Sigg Bottle just more manageable. They are also slightly easier to pack in an open side pocket on the back pack as well.

3 Litres is plenty for me. Here in Scotland, fresh water is always nearby and plentiful. Most of it travels horizontally through the air . Thankfully hot weather is a rare event rarely getting above 25 degrees Celsius. During the one or two days when the temperature becomes unbearably warm the cooler temperatures in the mountains is a welcome relieve.

I would stick with the gas stove. Its less messy, easier to light, has a greater controllable heat output and is generally a more reliable way to bring water to the boil. I wouldn't really attempt to bring to the boil more than a cup full (300ml) of water at any one time using Esbit tabs. The Esbit stove although may be a lighter alternative on warm windless days for making single cups of tea or coffee. The Esbit tablets have an unlimited lifetime even if exposed to the air. Esbit tablets are really useful in a PSK as well.