To begin with, I think it's great that you are looking for resources so that you can be a supportive partner. Just because he's bipolar doesn't mean it has to go bust, or be a continuous burden. I hub on this btw and provide links that may be of use.
READ and MEET (NAMI for starters)
In order to offer true support, you have to know what you are dealing with. Learn about the illness. The NAMI website can help you get basics under your belt. You might want to sign up for their "consumer groups" somewhere near your area. They offer meetings for people are in relationships with folks who are bipolar. There, you can talk to people who are in your shoes and get access to other resources.
5 TIPS FOR STARTERS
A million recommendations but here are tips: 1.) sleeping well helps keep mania and depression away. When this is off, it's often a flag.
2)He should seek a therapist and find out if he needs medication if it's severe. There are natural alternatives, but meds help & I believe are crucial if you've had serious issues. Holisitc approaches are successful for some, but in my opinion, unless you can levitate, omega oils aren't going to kick a delusion or manic episode. My analogy: If you're limping, a cane cane help. Maybe later on you can rehabilitate your leg and walk without it, but attempting to walk when you're in pain, on a bad leg can make things worse and lengthen the recovery process.
3) Eating healthfully is important. My shrink recommends omega oils. I know I just joked about it, but they do help. If his eating habits are out of his norm, something may be up.
4) Keep busy, don't linger at home for hours, interact- this can help him keep from focusing on himself too much and put things in perspective.
5)Having him express anxieties w/ you is productive if you've learned how to wind him down.
Hang in there! Small things string a good day together Nightnday