Shower adapter for Nalgene 96oz Cantene

The Cantene is a few years old. Mouth is ~60mm wide. Thinking about a homemade solar shower/ water preheater (to save on stove fuel) all in one unit. Any options?

Right now the only simple, but maybe not that effective solution I can think of is a spare cap with a few holes drilled into it.

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Sometimes for hauling a large amount of water, I use one of the liners from the apple juice cardboard boxes. I think the same liner is used in the cardboard box wine containers. These liners are virtually the same as the sunshowers that are sold in a lot of camping stores, but even with the drinks in them are only $3-4 (hmm, maybe $5-6 these days). There is (or used to be) a shower head with hose that plugged into these sold in REI and elsewhere for a couple bucks. I got one several years ago. It works very well, with the total cost being far less than an "official" sunshower, and it works just as well. Over the years, I have collected a half dozen of the liners, which I have used when taking groups on a "dry" hike - they hold 4 or 5 liters of water, so you fill them at or before the trailhead, hand one to each of your stronger hikers, and you have water at the campsite, even in the middle of Death Valley. If you take "Navy showers", one of the liners will provide 2 showers. They heat up quite nicely in the midday sun (sometimes almost too hot), even though the liners in the juice boxes are mostly aluminized mylar. Way lighter than a plastic jug, too. And much more durable than the Cantenes I have seen (these seem to develop cracks in the plastic within a couple years of use).

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