I'm having a PPE done on a horse who is a confirmed bleeder. Horse is 6 years old and runs on 3cc lasix 

I have never given a drug IV and am very uncomfortable with the idea of doing it myself, so I plan to use the oral version. Any thoughts/advice on that?

And then how do you manage them day-to-day? Supplements that you truly believe help? Not in place of lasix, but in addition to. 

How do you handle shows with lasix? 3-4 hours out and pull hay and water? 

Any advice/experiences would be helpful to me because this is a first! 

In my personal experience I have found that giving Race Today by Vetline Equine as a daily supplement and doing Lasix 3CC 3hours out IV has worked best for me. I do pull water but not hay. I will give electrolytes AFTER I run.

Sometimes shows where you do not know a good, estimated time of when you run are hard and I will allow a small sip of water if I end up being later in the draw, but most of the time I really try to plan my timing correctly to be 3 hours out.

Giving meds IV is not hard. My best advice is go seek help from a vet! When I discovered I had a bleeder my vet took the time to show me the proper way to IV so I was comfortable with me. I have never used the oral version so I do not have any insight on that.  

3 cc is a minimum dosage but personally I would still not be comfortable with administering the drug orally and protecting my horse. IM is my prefferred method.  Since the previous owner did IV, their timeline won't work for you.  You will need to play with timing if you switch how it's administered.

4cc/5cc (depending on pen size) for 4 hours is what I shoot for IM.  I *think* if you want any chance of oral being effective they need even longer for it to work.  IV would be the fastest, then IM, then Oral (though I wouldn't rely on it myself)

Water must be pulled when you dose or you lose any and all affects.  My horse gets to keep hay because he is extremely ulcer prone and the benefit of keeping hay in front outweighs the risk to me and my vet.  

I used to give lasix and hated every minute of it. I have now switched to Race Today and Equipulmin and have been able to get rid of lasix completly. Wow, what a game changer for my horse and for myself. Race Today is amazing!

The injectable can be given IV, IM, or orally. They just have different times they take to work. I never did IV, always IM. I did anywhere from 4-6cc (2.5 hours from saddling time), depended on ground and weather. If it was hot & muggy or super deep ground in summer I gave him the higher end. I just played with it for what worked. I let him keep eating hay and I left him with about an inch of water in a bucket. Which was more so to wash some hay down and one inch of a bucket wasn't going to make a huge difference. Electrolyte paste after the run and the day after if he didn't drink a lot afterward. After I ran, if I was done running for the day, I only gave him half a bucket of water and gradually gave more over a couple hours so he didn't just gorge on water. If I was going to run again then I'd let him have a couple sips and didn't give him anymore lasix. 

I kept him on MVP Air-Way EQ and ran with the Breathe O2 paste. And I kept him really fit, like 1-2 hour rides a day, 5 days a week. And one day just walked for an hour around fields or wherever. He would longtot 20-30 minutes a day and lope 20 a day. And a couple days a week I'd breeze at a good clip, and ask for about 100 feet of full out. Days I did that just gave him the breathe past and no lasix. He fired much harder once I started giving him the MVP products, and eventually I pulled him down to 3cc because that seemed to be working. But before I started the MVP products it took about a year to really fine tune the sweet spot with the lasix. So don't be discouraged if it takes you a bit to figure out what exactly works