Water orb: where to get it

Source	Quantity	Chance per roll
Acheron mammoth []	8–12	10/128
Anagami []	2–5	7/128
Arhat []	2–5	7/128
Bag of lost items []	14	Uncommon
Basilisk []	1	2/128
Box of summoning ingredients (Familiarisation) []	25–42	Unknown, 2 rolls
Brazier (Guthixian temple) (Water) [{'content': "Only if the player hasn't already obtained the item during While Guthix Sleeps.", 'name': 'wgs'}]	1	Once
Chest (Wizards' Guild) [{'content': 'Estimated rarity may be inaccurate due to a low sample size.', 'name': 'inaccurate'}]	5	107/996
Corrupted dust devil []	2	10/128
Frank's Free Chest (January 2023) []	50	75/2,391
Frost dragon []	2	2/128
Giant Sea Snake []	1	3/128
Icefiend []	2	8/128
Luminous snaggler []	4–8	10/104
Murderous bakami []	4–6	1/17
Murderous bakami jar []	4–6	1/17
Murderous orokami []	4–6	Uncommon
Murderous orokami jar []	4–6	1/17
Sakadagami []	1–2	7/128
Sea Snake Hatchling []	1	3/128
Sea Snake Young []	1	3/128
Sotapanna []	1	7/128
Spirit impling []	2	Rare
Spirit impling jar []	2	1/130
Waterfiend []	2	8/128
Waterfiend []	5	5/40, 3 rolls
Waterfiend (Ghorrock) []	2	8/128