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I would think, unless there's a problem, doing smaller amounts more frequently would be good. Do the five gallons five times a week in 1 gal. increments.
I agree that almost anything is cheaper than buying your water. But if you're going to be spending $22.00 per month on DI cartridges, in six months you would have spent enough to buy a good 4 stage RO/DI unit, that would probably last you for many years.
i.e...
I have never tried just running DI, but I would think that you will be burning through the resin fairly fast. I know I have about 1ppm after the membrane/going into the DI canister, and have to change the resin about every 6 months. I can't imagine how long it would last with an input of 90 or...