For water I would recommend this http://pureklenz.co.uk/purified-wate...FUWVGwod0aYNDQ as BP/EP grade water is manufactured to a defined specification,DI is not and the QC is generally rubbish,or in some cases non existent.I've worked on 100's DI/BP systems over the years and it's not uncommon to find diluted HCL and NaOh being passed to service from DI systems with the client being totally unaware as they had zero QC in place and relied on the plant alone,also DI will have high bacterial count's,not good for non alcoholic mixes as the bugs will grow quickly,see here http://forums.stevehoffman.tv/thread...rading.399260/
IPA can be purchase on line and I use dishwasher rinse aid as a surfactant.I tried lart du son but found it left a residue and needed another rinse with pure water to remove it,never bother with the IPA mix,once is enough.