Hi guys how do you keep your bucket (with water) in your vans? i'm wfp but also do a bit of trad shops mainly but water goes everywhere, very annoying
First of all I will state the obvious by saying to make sure it's a rectangular bucket rather than a builders bucket. Ok so you do that anyway - good

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Don't fill it any more than a third to half way at most and, as others have said, keep a few tools in there. The real big help though is to lay a scrim on top of it. Alternatively, you can buy them with lids on.
I keep mine in the passenger footwell. If you have a passenger, you may need to re-think that though.