DIY - hose for portable bathtub

Eldi_Dos

If any water is left in bath when you use discharge hose into shower drain just use a sink and bath unblocker to push the last few litres through hose.

inkydolphin

Bendy_House said:

I didn't ask the obvious, Court - are you a DIYer to any degree?! Do you have a cordless electric drill? (Ideally cordless, tho' corded is fine)

Jobbie-def-jobbed: https://www.ebay.co.uk/itm/304577974794?

Whatever length of hose required to connect to the bath's outlet spigot to get safely inside the shower tray, securely jubilee-clipped in place to the bath so no leaks. This wee pump fitted wherever it's most convenient along the way, again securely clipped so no leaks.

For filling, put cap on the end of the pipe, or else just have it held upwards above the required bath water level. When bath is done, lower the hose end/remove cap, and allow it to drain under gravity as much as it can. Then attach cordless drill, and whirrrrr away. 

Search for "whale babyfoot pump" - a possible manual alternative?