Welcome to Sugar Glider Parenthood and to the forum.
You may have already discovered that your furry friends are SUGAR GLIDERS - not sugar bears. That is a term used by pocket pets to direct owner's researching their new furry companions to their own web sites which will come up first searching sugar bear in the search query.
The "HPW" now refers to many different glider staples. Originally it was the name of a diet we now refer to as Original HPW which is made using a produce called Wombaroo High Protein Supplement which is imported from Australia.
The recipe for the Original HPW can be found here:
http://www.hpwdietcenter.com/original.html
Wombaroo High Protein Supplement can be purchased here:
http://www.thepamperedglider.com/supplements.htm
More recent HPW diets are the HPW Plus which is made exactly the same as Original HPW but using a new product (HPW Plus powder) in place of the Wombaroo High Protein Supplement.
The other widely used "HPW" is HPW Complete - which is the EXACTLY same product as your Glider Gravy which Pocket Pets purchases from the developer of HPW Plus and HPW Complete and relabels as if it is their own product.
If you and your glider are happy with Glider Gravy, you can probably order more directly from the source for less than you will pay Pocket Pets.
Information on all of these "HPW" diets and ordering information for HPW Plus and HPW Complete can be found here:
http://www.critterlove.com/diet-info.html
LGRS stands for Lucky Glider Rescue Soup - directions for this diet can be found here:
http://files.meetup.com/768852/LGRSSuggieSoup.pdf
There are other widely used glider diets you might also want to look at. I have links to several of them on my web page along with complete information on my own GliderKids Feeding Plan which also uses Wombaroo High Protein Supplement in most of my recipes.
http://www.gliderkids-diet.com/Staple-Recipes.html
I would not bother ordering the Glider Chow - it should not be a main part of your glider's diet. Glider's digestive systems are just not designed for hard dry processed foods. Choose one of the above nectar like staples and feed it along with a wide variety of fresh or frozen fruits and vegetables to complete the nightly feedings and your glider will get all the nourishment needed daily.
Feel free to ask questions here - we are all happy to help.
Some of the advice you may have been given by the SALES REPRESENTATIVES for Pocket Pets from their memorized script may have been misleading and even some very bad advice - like the claim that sugar gliders will be good friends with your other pets - NEVER allow your gliders to come in direct contact with other animals. Even a very gently cat or dog could severely injure a glider with one playful swipe of a paw.